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\(\dfrac{16}{27}xX=\dfrac{10}{27}-\dfrac{6}{27}\)
\(\dfrac{16}{27}xX=\dfrac{4}{27}\)
\(X=\dfrac{4}{27}:\dfrac{16}{27}\)
X=\(\dfrac{1}{4}\)
16/27x X+2/9=10/27
16/27x X=10/27-2/9
16/27x X=4/27
X=4/27:16/27
X=1/4
M×9/16=27/8
M=27/8÷9/16
M=6
4/9÷m=2/27
M=4/9÷2/27
M=6
a: =>12/25:x=9/25-1/5=4/25
=>x=3
b: =>8/17x=10/27-2/9=10/27-6/27=4/27
hay x=17/54
X/7=10/14 : X la 5
4/9=x/27 : x la 12
15/24=x/32: 15/24= 5/8: vậy X= 20
Bài 1:
a) 19/27+9/7+6/27+5/7+2/7
= (19/27+6/27) + (9/7+5/7+2/7)
=1 + 16/7
=23/7
b) 2/7 + 27/48 + 7/16 +45/63
= (2/7 + 45/63) + (27/48 +7/16)
= (2/7 + 5/7) + ( 9/16 + 7/16)
= 1 + 1
=2
c) Tính bằng cách bình thường
Bài 2:
6/11 + x = 1
x = 1-6/11
x = 5/11
Bài làm
a) \(\frac{19}{27}+\frac{9}{7}+\frac{6}{27}+\frac{5}{7}+\frac{2}{7}\)
\(=\frac{27}{27}+\frac{16}{7}\)
\(=1+\frac{16}{7}\)
\(=\frac{7}{7}+\frac{16}{7}\)
\(=\frac{23}{7}\)
b) \(\frac{2}{7}+\frac{27}{48}+\frac{7}{16}+\frac{45}{63}\)
\(=\left(\frac{18}{63}+\frac{45}{63}\right)+\left(\frac{27}{48}+\frac{21}{48}\right)\)
\(=\frac{63}{63}+\frac{48}{48}\)
\(=1+1\)
\(=2\)
c) \(\frac{17}{23}+\left(\frac{4}{7}-\frac{6}{13}\right)\)
\(=\frac{17}{23}+\left(\frac{52}{91}-\frac{42}{91}\right)\)
\(=\frac{17}{23}+\frac{10}{91}\)
\(=\frac{1547}{2093}+\frac{230}{2093}\)
\(=\frac{1770}{2093}\)
Bài 2
\(\frac{6}{11}+x=1\)
\(x=1-\frac{6}{11}\)
\(x=\frac{11}{11}-\frac{6}{11}=\frac{5}{11}\)
Vậy \(x=\frac{5}{11}\)
a. 3.(5+2+3)=30
b. 9.(2+5+3)=90
c. 8.(5-2+6)=72
d. (1000-298).(140:14-10)=702.0=0
Hướng dẫn giải:
a) 5 x (10 + 9)
Cách 1:
5 x (10 + 9) = 5 x 19 = 95
Cách 2:
5 x (10 + 9) = 5 x 10 + 5 x 9 = 50 + 45 = 95
b) 10 x (30 + 5)
Cách 1:
10 x (30 + 5) = 10 x 35 = 350
Cách 2:
10 x (30 + 5) = 10 x 30 + 10 x 5 = 300 + 50 = 350
Hướng dẫn giải nè :
a) 5 x (10 + 9)
Cách 1:
5 x (10 + 9) = 5 x 19 = 95
Cách 2:
5 x (10 + 9) = 5 x 10 + 5 x 9 = 50 + 45 = 95
b) 10 x (30 + 5)
Cách 1:
10 x (30 + 5) = 10 x 35 = 350
Cách 2:
10 x (30 + 5) = 10 x 30 + 10 x 5 = 300 + 50 = 350
y + \(\dfrac{16}{9}\) = \(\dfrac{25}{9}\)
y = \(\dfrac{25}{9}\) - \(\dfrac{16}{9}\)
y = 1
ta có : y+\(\dfrac{4}{9}\)+\(\dfrac{8}{18}\)+\(\dfrac{12}{27}\)+\(\dfrac{16}{36}\)=\(\dfrac{25}{9}\)
⇒ y+\(\dfrac{16}{9}\)=\(\dfrac{25}{9}\)
⇒ y=\(\dfrac{25}{9}-\dfrac{16}{9}\)
⇒ y=1
Vậy y=1
Chúc bạn học tốt nha !
S=1/4