第3页 - 经纶学典学霸五年级数学上下册【江苏国标】

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$ \begin{aligned} x÷5&=1.8 \\ 解得x&=9 \\ \end{aligned}$

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5.1

12

8

$ \begin{aligned}面包单价：25x&=70 \\ 解得x&=2.8 \\ \end{aligned}$

$132.4-70=62.4(元)$

$所以z=62.4$

$ \begin{aligned}色拉油数量：8y&=62.4 \\ 解得y&=7.8 \\ \end{aligned}$

$答：x=2.8，y=7.8，z=62.4.$

$ \begin{aligned}x-860&=1300 \\ 解得x&=2160 \\ \end{aligned}$

$ \begin{aligned}18x&=360 \\ 解得x&=20 \\ \end{aligned}$

$ \begin{aligned}5x&=30 \\ 解得x&=6 \\ \end{aligned}$

$答：x的值是6厘米。$

$ \begin{aligned}解:0.8+x-0.8 &=10.2-0.8 \\ x &= 9.4 \\ \end{aligned}$

$ \begin{aligned}解:x-9.65+9.65&= 3.6+9.65 \\ x&= 13.25 \\ \end{aligned}$

$ \begin{aligned}解:1.4x÷1.4&=4.2÷1.4 \\ x&=3 \\ \end{aligned}$

$ \begin{aligned}解:x÷0.6×0.6&=4.2×0.6 \\ x&=2.52 \\ \end{aligned}$