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a) \(\frac{3}{8}+\frac{7}{12}+\frac{10}{16}+\frac{10}{24}\)
\(=\frac{3}{8}+\frac{7}{12}+\frac{5}{8}+\frac{5}{12}\)
\(=\left(\frac{3}{8}+\frac{5}{8}\right)+\left(\frac{7}{12}+\frac{5}{12}\right)\)
\(=1+1\)
\(=2\)
b) \(\frac{4}{6}+\frac{7}{13}+\frac{17}{9}+\frac{19}{13}+\frac{1}{9}+\frac{14}{6}\)
\(=\frac{2}{3}+\frac{7}{13}+\frac{17}{9}+\frac{19}{13}+\frac{1}{9}+\frac{7}{3}\)
\(=\left(\frac{2}{3}+\frac{7}{3}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)+\left(\frac{1}{9}+\frac{17}{9}\right)\)
\(=\frac{9}{3}+\frac{26}{13}+\frac{18}{9}\)
\(=3+2+2\)
\(=7\)
a) 2(x - 5) - 3(x + 7) = 14
<=> 2x - 10 - 3x - 21 = 14
<=> 2x - 3x = 14 + 10 + 21
<=> x = -45
Vậy x = -45
b) 5(x - 6) - 2(x + 3) = 12
<=> 5x - 30 - 2x - 6 = 12
<=> 5x - 2x = 12 + 30 + 6
<=> 3x = 48
<=> x = 16
Vậy x = 16
c) 3(x - 4) - (8 - x) = 12
<=> 3x - 12 - 8 + x = 12
<=> 3x + x = 12 + 12 + 8
<=> 4x = 32
<=> x = 8
Vậy x = 8
d) -7(3x - 5) + (7x - 14) = 28
<=> -21x + 35 + 7x - 14 = 28
<=> -21x + 7x = 28 - 35 + 14
<=> -14x = 7
<=> x = -1/2
Vậy x = -1/2
\(a,2\left(x-5\right)-3\left(x+7\right)=14\)
\(\Leftrightarrow2x-10-3x-21=14\)
\(\Leftrightarrow-x=45\)
\(\Leftrightarrow x=-45\)
\(b,5\left(x-6\right)-2\left(x+3\right)=12\)
\(\Leftrightarrow5x-30-2x-6=12\)
\(\Leftrightarrow3x=48\)
\(\Leftrightarrow x=16\)
\(c,3\left(x-4\right)-\left(8-x\right)=12\)
\(\Leftrightarrow3x-12-8+x=12\)
\(\Leftrightarrow4x=32\)
\(\Leftrightarrow x=8\)
\(d,-7\left(3x-5\right)+2\left(7x-14\right)=28\)
\(\Leftrightarrow-21x+35+14x-28=28\)
\(\Leftrightarrow-7x=21\)
\(\Leftrightarrow x=-3\)
(x + 3x + 4x + 5x ) + 254 : 57 = 135
13x + (52)4 : 57 = 135
13x + 58 : 57 = 135
13x + 5 = 135
13x = 130
x = 10
Vậy x = 10
K nha
( x + 3x + 4x + 5x ) +254 : 57 = 135
(x+3x+4x+5x)+58:57=135
x(3+4+5)+5=135
12x=135-5
12x=130
x=\(\frac{65}{6}\)
Vậy x=....
suy ra x+3=-(x+3) (1) hoặc x+3(2)
giải (1)x+3=-(x+3)
suy ra 2x=3+(-3)=0
suy ra x=0
giải (2)
x+3=x+3
suy ra 2x=3+3=6
suy ra x=6:2=3
vậy x=0 hoặc x=3
\(45-40-3x=-12-4x\)
\(5-3x+12+4x=0\)
\(-3x+4x=-5-12\)
\(x=-7\)
b,\(11x-7=9x-13\)
\(11x-9x=7-13\)
\(2x=-6\)
\(x=-3\)
Mình làm luôn không viết lại đề bài bẹn thông cảm nhé :))
( 45 - 40 ) - 3x = -12 - 4x
5 - 3x = -12 - 4x
-3x + 4x = -12 -5
x = -17