Tìm x theo cách lớp 5 ạ: a) X/12 -1/4 = 2/3÷2 b) 2/5 + x/9 = 2 – 1 $\frac{1}{2}$ 07/07/2021 Bởi Claire Tìm x theo cách lớp 5 ạ: a) X/12 -1/4 = 2/3÷2 b) 2/5 + x/9 = 2 – 1 $\frac{1}{2}$
a, $\frac{x}{12}-\frac{1}{4}= \frac{2}{3}:2$ $\frac{x}{12}= \frac{1}{4}+\frac{2}{3}:2$ $\frac{x}{12}= \frac{1}{4}+\frac{1}{3}$ $\frac{x}{12}= \frac{7}{12}$ $x= 7$ b, $\frac{2}{5}+\frac{x}{9}= 2-1\frac{1}{2}$ $\frac{2}{5}+\frac{x}{9}= \frac{1}{2}$ $\frac{x}{9}= \frac{1}{2}-\frac{2}{5}$ $\frac{x}{9}= \frac{1}{10}$ $x= \frac{1}{10}×9= \frac{9}{10}$ Bình luận
A)x/12-1/4=2/6 x/12=2/6+1/4 x/12=7/12 =>x=7 B) 2/5+x/9=2-3/2 2/5+x/9=1/2 x/9=1/2-2/5 =>ko có giá trị nào thoả mãn Bình luận
a, $\frac{x}{12}-\frac{1}{4}= \frac{2}{3}:2$
$\frac{x}{12}= \frac{1}{4}+\frac{2}{3}:2$
$\frac{x}{12}= \frac{1}{4}+\frac{1}{3}$
$\frac{x}{12}= \frac{7}{12}$
$x= 7$
b, $\frac{2}{5}+\frac{x}{9}= 2-1\frac{1}{2}$
$\frac{2}{5}+\frac{x}{9}= \frac{1}{2}$
$\frac{x}{9}= \frac{1}{2}-\frac{2}{5}$
$\frac{x}{9}= \frac{1}{10}$
$x= \frac{1}{10}×9= \frac{9}{10}$
A)x/12-1/4=2/6
x/12=2/6+1/4
x/12=7/12
=>x=7
B) 2/5+x/9=2-3/2
2/5+x/9=1/2
x/9=1/2-2/5
=>ko có giá trị nào thoả mãn