整理与练习(2)
1:
⑴ B
⑵ A
⑶ C
⑷ B
⑸ A
2:
2x+52x=162
54x=162
x=3
10.5x-7.5x=0.9
3x=0.9
x=0.3
5x-2.5x=5
2.5x=5
x=2
4.2x+3×1.3=16.5
4.2x+3.9=16.5
4.2x=12.6
x=3
5x-0.5×32=48
5x-16=48
5x=64
x=12.8
9y÷2=20.5+20
9y÷2=40.5
9y=81
y=9
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