解方程,2.55÷x=0.4 ,13x-2x-7x=26 ,0.21x6+16x=50.86,6x-1.5（x+10）=5.7
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解方程,2.55÷x=0.4 ,13x-2x-7x=26 ,0.21x6+16x=50.86,6x-1.5（x+10）=5.7
解方程,2.55÷x=0.4 ,13x-2x-7x=26 ,0.21x6+16x=50.86,6x-1.5（x+10）=5.7
解方程,2.55÷x=0.4 ,13x-2x-7x=26 ,0.21x6+16x=50.86,6x-1.5（x+10）=5.7
2.55÷x=0.4
x=2.55÷0.4
x=6.375
13x-2x-7x=26
4x=26
x=26÷4
x=6.5
0.21x6+16x=50.86
1.26+16x=50.86
16x=50.86-1.26
x=49.6÷16
x=3.1
6x-1.5（x+10）=5.7
6x-1.5x-15=5.7
4.5x=5.7+15
x=20.7÷4.5
x=4.6
2.25÷x=0.4
x=2.25÷0.4
x=6.375
13x-2x-7x=26
4x=26
x=6.5
0.21*6+16x=50.86
1.26+16x=50.86
16x=49.6
...
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2.25÷x=0.4
x=2.25÷0.4
x=6.375
13x-2x-7x=26
4x=26
x=6.5
0.21*6+16x=50.86
1.26+16x=50.86
16x=49.6
x=3.1
6x-1.5*（x+10）=5.7
6x-1.5x-15=5.7
5.5x=20.7
x=4.6
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2.55÷x=0.4
0.4x=2.55
x=6.375
，13x-2x-7x=26
4x=26
x=6.5
，0.21x6+16x=50.86
16x=49.6
...
全部展开
2.55÷x=0.4
0.4x=2.55
x=6.375
，13x-2x-7x=26
4x=26
x=6.5
，0.21x6+16x=50.86
16x=49.6
x=3.1
，6x-1.5（x+10) =5.7
6x-1.5x-15=5.7
4.5x=5.7+15
4.5x=20.7
x=4.6
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