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3
A
B
A
B
A
A
B
解: x-6.1+6.1 =
3.8+6.1
x =
9.9
解: 14x =
210
14x÷14 =
210÷14
x =
15
解: 0.2x =
6
0.2x÷0.2 =
6÷0.2
x =
30
解: x+42 =
72
x+42-42 =
72-42
x =
30
解:
x÷3.6-2.4+2.4 =
0.6+2.4
x÷3.6 =
3
x÷3.6×3.6 =
3×3.6
x =
10.8
解：x+1.6=0.8÷0.04
x+1.6=20
x=18.4
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