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25 tháng 9 2015
a) 6 + 2 x (4 - 3) x 2 = 10
b) (6 + 2) x 4 - 3 x 2 = 26
c) 6 + (2 x 4 - 3) x 2 = 16
d) 6 + (2 x 4 - 3 x 2) = 8
14 tháng 10 2020
a) 6+{2*[(4-3)*2]}=10
b) {[(6+2)*4]-3*2}=26
c) 6+[(2*4-3)*2]=16
d) 6+(2*4-3*2)=8
HT
20 tháng 9 2016
a, 6 + 2 x (4 - 3) x 2 = 10
b, (6 + 2) x 4 - 3 x 2 = 26
c, 6 + (2 x 4 - 3) x 2 = 16
d, 6 + 2 x 4 - 3 x 2 = 8
BP
1
MT
9 tháng 2 2018
a;26/x+3 la so nguyen nen 2 6 chia het cho x+3
dan den x+3 thuoc uoc cua 26
ma uoc cua 26 la 1;-1;2;-2;13;-13;26;-26
khi x+3=1 thi x=-2 khi x+3=13 thi x= 10
khi x+3=-1 thi x=-4 khi x+3=-13 thi x=-16
khi x+3=2 thi x=-1 khi x+3=26 thi x= 23
khi x+3=-2 thi x=-5 khi x+3=-26 thi x= -29
x-2/x+3 la so nguyen nghia la x-2 chia het cho x+3
x-2 =x+3-5 chia het cho x+3
suy ra 5 chia het cho x+3
ma uoc cua 5 la -5;-1;5;1
khi x+3=-5thi x=-8 khi x+3 =5 thi x=2
khi x+3=-1 thi x=-4 khi x+3=1 thi x=-2
x+6/x+3 la so nguyen nen x+6 chia het cho x+3
ta co x+6 =x+3+3 chia het cho x+3
suy ra 3 chia het cho x+3
ma uoc cua x+3 la 3;1;-1;-3
khi x+3=3thi x=0 khi x+3=-3 thi x=-6
khi x+3=1 thi x=-2 khi x+3 = -1 thi x=-4
15/x-4 la so nguyen nen 15 chia het cho x-4
ma uoc cua 15 la 1;3;5;15;-1;-3;-5;-15
khi x-4=1 thi x=5 khi x-4=-1 thi x=3
khi x-4 =3 thi x=7 khi x-4 =-3 thi x=1
khi x-4=5 thi x=9 khi x-4 =-5 thi x =-1
khi x-4=15 thi x=19 khi x-4=-15 thi x=-11
3 tháng 3 2020
a,\(x+3=15\)
\(=>x=15-3=12\)
b,\(x-7+3=25\)
\(=>x=25+7-3=29\)
c,\(x-3-6=-4\)
\(=>x=-4+6+3=5\)
d,\(26-x+9=-13\)
\(=>26-x=-13-9=-22\)
\(=>26+22=x\)
\(=>x=48\)
3 tháng 3 2020
x+3=15
x=15-3
x=12
Vậy x=12
x-7+3=25
x-7=25-3
x-7=22
x=22+7
x=29
Vậy x=29
x-3-6=-4
x-3=-4+6
x-3=2
x=2+3
x=5
Vậy x=5
26-x+9=-13
26-x=-13-9
26-x=22
x=26-22
x=4
Vậy x=4
26 tháng 8 2018
a) \(\frac{-x}{2}+\frac{2x}{3}+x+\frac{1}{4}+2x+\frac{1}{6}=\frac{3}{8}.\)
\(\frac{-x}{2}+\frac{2x}{3}+3x+\frac{5}{12}=\frac{3}{8}\)
\(x.\left(-\frac{1}{2}+\frac{2}{3}+3\right)+\frac{5}{12}=\frac{3}{8}\)
\(x\cdot\frac{19}{6}=-\frac{1}{24}\)
x = -1/76
26 tháng 8 2018
b) \(\frac{3}{2x+1}+\frac{10}{4x+2}-\frac{6}{6x+3}=\frac{12}{26}\)
\(\frac{3}{2x+1}+\frac{2.5}{2.\left(2x+1\right)}-\frac{2.3}{3.\left(2x+1\right)}=\frac{6}{13}\)
\(\frac{3}{2x+1}+\frac{5}{2x+1}-\frac{2}{2x+1}=\frac{6}{13}\)
\(\frac{3+5-2}{2x+1}=\frac{6}{13}\)
\(\frac{6}{2x+1}=\frac{6}{13}\)
=> 2x + 1 = 13
2x = 12
x = 6
2 tháng 6 2018
đề như z ak bn!
a)* 3x =26
=> x = 26/3
* 3x = 6
=> x = 2
b) \(x:4\times\frac{1}{3}=2,5\)
\(x\times\frac{1}{4}\times\frac{1}{3}=2,5\)
\(x\times\frac{1}{12}=2,5\)
\(x=2,5:\frac{1}{12}\)
\(x=30\)
c) \(\frac{3}{4x}=\frac{1}{2}=\frac{3}{6}\)
\(\Rightarrow\frac{3}{4x}=\frac{3}{6}\)
\(\Rightarrow4x=6\)
\(x=6:4\)
\(x=\frac{3}{2}\)
nếu như đề mk viết sai thì nhắn lại cho mk, mk sửa nha!
S
28 tháng 9 2016
a) 6 + 2 x 4 - 3 x 2 = 10
= 6 + 2 x ( 4 - 3 ) x 2 = 10
b) 6 + 2 x 4 - 3 x 2 = 26
= ( 6 + 2 ) x 4 - 3 x 2 = 26
a) 6 + 2 x 4 - 3 x 2 = 10
= 6 + 2 x ( 4 - 3 ) x 2 = 10
b) 6 + 2 x 4 - 3 x 2 = 26
= ( 6 + 2 ) x 4 - 3 x 2 = 26
28 tháng 9 2016
Bài giải của mình:
a)6 + 2 x(4 - 3) x2 =10
Thử lại:
=6+ 2 x 1 x2
=6+2x2
6+4=10
b)( 6 + 2) x 4 -3 x 2 =26
Thử lại:
=8 x 4 - 3 x2
=32 - 6
=26
18 tháng 4 2023
\(1,-\dfrac{4}{7}+\dfrac{2}{3}\times\dfrac{-9}{14}\)
\(=\dfrac{-4}{7}+\dfrac{-18}{42}\)
\(=\dfrac{-4\times6}{7\times6}+\dfrac{-18}{42}\)
\(=\dfrac{-20}{42}+\dfrac{-18}{42}\)
\(=-\dfrac{38}{42}\)
\(=-\dfrac{19}{21}\)
\(2,\dfrac{17}{13}-\left(\dfrac{4}{13}-11\right)\)
\(=\dfrac{17}{13}-\dfrac{4}{13}+11\)
\(=\dfrac{13}{13}+11\)
\(=1+11\)
\(=12\)
\(3,8\dfrac{2}{7}-\left(3\dfrac{4}{9}+4\dfrac{2}{7}\right)\)
\(=\dfrac{58}{7}-\left(\dfrac{31}{9}+\dfrac{30}{7}\right)\)
\(=\dfrac{58}{7}-\dfrac{31}{9}-\dfrac{30}{7}\)
\(=\dfrac{58}{7}-\dfrac{30}{7}-\dfrac{31}{9}\)
\(=\dfrac{28}{7}-\dfrac{31}{9}\)
\(=\dfrac{28\times9}{7\times9}-\dfrac{31\times7}{9\times7}\)
\(=\dfrac{252}{63}-\dfrac{217}{63}\)
\(=\dfrac{35}{63}\)
\(=\dfrac{5}{9}\)
\(5,\left(\dfrac{2}{3}-1\dfrac{1}{2}\right):\dfrac{4}{3}+\dfrac{1}{2}\)
\(=\left(\dfrac{2}{3}-\dfrac{3}{2}\right):\dfrac{4}{3}+\dfrac{1}{2}\)
\(=\left(\dfrac{2\times2}{3\times2}-\dfrac{3\times3}{2\times3}\right):\dfrac{4}{3}+\dfrac{1}{2}\)
\(=\left(\dfrac{4}{6}-\dfrac{9}{6}\right):\dfrac{4}{3}+\dfrac{1}{2}\)
\(=\dfrac{-5}{6}:\dfrac{4}{3}+\dfrac{1}{2}\)
\(=\dfrac{-5}{6}\times\dfrac{3}{4}+\dfrac{1}{2}\)
\(=\dfrac{-15}{24}+\dfrac{1}{2}\)
\(=\dfrac{-15}{24}+\dfrac{1\times12}{2\times12}\)
\(=\dfrac{-15}{24}+\dfrac{12}{24}\)
\(=\dfrac{-3}{24}\)
\(=-\dfrac{1}{8}\)
\(6,\dfrac{-5}{13}+\dfrac{2}{5}+\dfrac{-8}{13}+\dfrac{3}{5}-\dfrac{3}{7}\)
\(=\left(\dfrac{-5}{13}+\dfrac{-8}{13}\right)+\left(\dfrac{2}{5}+\dfrac{3}{5}\right)-\dfrac{3}{7}\)
\(=\dfrac{-13}{13}+\dfrac{5}{5}-\dfrac{3}{7}\)
\(=-1+1-\dfrac{3}{7}\)
\(=-\dfrac{3}{7}\)
\(7,\dfrac{6}{5}\times\dfrac{3}{7}+\dfrac{6}{5}:\dfrac{7}{10}+\dfrac{6}{5}\)
\(=\dfrac{6}{5}\times\dfrac{3}{7}+\dfrac{6}{5}\times\dfrac{10}{7}+\dfrac{6}{5}\)
\(=\dfrac{6}{5}\times\left(\dfrac{3}{7}+\dfrac{10}{7}+1\right)\)
\(=\dfrac{6}{5}\times\left(\dfrac{3}{7}+\dfrac{10}{7}+\dfrac{1\times7}{1\times7}\right)\)
\(=\dfrac{6}{5}\times\left(\dfrac{3}{7}+\dfrac{10}{7}+\dfrac{7}{7}\right)\)
\(=\dfrac{6}{5}\times\dfrac{20}{7}\)
\(=\dfrac{120}{35}\)
\(=\dfrac{24}{7}\)
