20道五年级解方程应用题，有答案，要快啊！

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7χ－2×9＝80 6x－4x＝20.2 （χ+12）÷4＝4.5
解:7x-18=80 解:2x=20.2 解:(x+12)/4*4=4.5*4
7x-18+18=80-+18 2x/2=20.2/2 x+12=18
x=98 x=10.1 x+12-12=18-12
x=6

6x－0.4×6 = 9.6 4x ＋80 = 160
解:6x-2.4=9.6 解:4x+80-80=160-80
6x-2.4+2.4=9.6+2.4 4x=80
6x=12 4x/4=80/4
x=2 x=20
x-8.2＝4.4 8x＝32
解：x＝4.4+8.2 解: x＝32÷8
8x=32
解；x=32/8
x =4

4x=4,x=1
4x=8,x=2
4x=12,x=3
4x=16,x=4
4x=20,x=5
4x=24,x=6
4x=28,x=7
4x=32,x=8
4x=36,x=9
4x=40,x=10
4x=44,x=11
4x=48,x=12
4x=52,x=13
4x=56,x=14
4x=60,x=15
4x=64,x=16
4x=68,x=17
4x=72,x=18
4x=76,x=19
4x=80,x=20