[1].x-16.4=80 [2]28-2x=13 [3]3x+2x=25 [4]32-2x=30 [5] [x+5]*8=320 [6]x-2分之1x=2
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[1].x-16.4=80 [2]28-2x=13 [3]3x+2x=25 [4]32-2x=30 [5] [x+5]*8=320 [6]x-2分之1x=2
[1].x-16.4=80 [2]28-2x=13 [3]3x+2x=25 [4]32-2x=30 [5] [x+5]*8=320 [6]x-2分之1x=2
[1].x-16.4=80 [2]28-2x=13 [3]3x+2x=25 [4]32-2x=30 [5] [x+5]*8=320 [6]x-2分之1x=2
[1].x-16.4=80
X=80+16.4
X=96.4
[2]28-2x=13
2X=28-13
2X=15
X=7.5
[3]3x+2x=25
5X=25
X=5
[4]32-2x=30
2X=32-30
2X=2
X=1
[5] [x+5]*8=320
X+5=320÷8
X+5=40
X=40-5
X=35
[6]x-2分之1x=2
2分之1X=2
X=2÷1/2
X=4
[1].x-16.4=80
x=80+16.4
=96.4
[2]28-2x=13
2x=28-13
2x=15
x=7.5
[3]3x+2x=25
5x=25
x=5
[4]32-2x=30
[5] [x+5]*8=320
x+5=40
x=40-5
x=35
[6]x-2分之1x=2
1/2x=2
x=4
[1].x-16.4=80
X=80+16.4
X=96.4
[2]28-2x=13
2X=28-13
2X= 15
X=7.5
[3]3x+2x=25
5X=25
...
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[1].x-16.4=80
X=80+16.4
X=96.4
[2]28-2x=13
2X=28-13
2X= 15
X=7.5
[3]3x+2x=25
5X=25
X=5
[4]32-2x=30
2X=32-30
2X=2
X=1
[5] [x+5]*8=320
X+5=320÷8
X+5=40
X=35
[6]x-2分之1x=2
1/2X=2
X=2×2
X=4
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