第8页 - 苏教版数学补充习题五年级上下册答案

+

26

×

2

106

-

15

920

÷

23

91

40

$\begin{aligned} 解：3x&=122-77\\3x& =45\\x &=15\end{aligned}$

$\begin{aligned}解：5x&=0.9 + 1.6\\5x&=2.5\\x&=0.5\end{aligned}$

$\begin{aligned}解：6x&=20 + 13.6\\6x&=33.6\\x&=5.6\end{aligned}$

$\begin{aligned}解：x-2.5 &=12\\x &=12+2.5\\x&=14.5\end{aligned}$

$\begin{aligned}解：4x&=1.8 × 2\\4x&=3.6\\x&=0.9\end{aligned}$

$\begin{aligned}解：0.8x&=12.8 × 4\\0.8x&=51.2\\x&=64\end{aligned}$

$解：设它的高是x米$

$\begin{aligned}5.6x&=11.2\\x&=11.2÷5.6\\x&=2\end{aligned}$

$答：它的高是2米。$