1. (1)x=32
(2)x=20
(3)x=3
(4)x=7
(5)x=100
2: (1)- 36 28
(2)+ 0.8 2.7
(3)÷ 3 15
(4)x 1.6 3.2
3: x=2.5 x=1.9 x=5.8
x=4 x=2.1 x=6.3
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