第54页 - 通城学典课时作业本六年级数学苏教版江苏专用

$8.5a+6.5b$

$\frac{180−a}{2}$

$\frac{b}{5}$

$140\%x$

$3a$

$3a+6$

$4n−2$

$ \begin{aligned}解：0.4x&=4-1.6 \\ 0.4x&=2.4 \\ x&=6 \\ \end{aligned}$

$ \begin{aligned}解：0.22x&=44 \\ x&=200 \\ \end{aligned}$

$ \begin{aligned}解：1.4x&=\frac {9}{14} \\ \frac {7}{5}x&=\frac {9}{14} \\ x&=\frac {45}{98} \\ \end{aligned}$

$ \begin{aligned}解：7x&=2×4.5 \\ x&=\frac {9}{7} \\ \end{aligned}$

A

C

B

46.4

50

5

30

25

乙

196