1. [(1-5/12)X+5]:X=2:3
解,得:
2x==[(1-5/12)X+5]*3
2x==[(7x/12)+5]*3
2x==(7x/4)+15
8x==7x+60
x==60
2. 5/4X-75=100
解,得:
5-300x==400x
-700x==-5
x==1/140
3.75-4/6X=0.25
解,得:
22.5x-4==1.5x
21x==4
x==4/21请采纳
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解方程 每一步都要详细,一步一步来。
1. [(1-5/12)X+5]:X=2:3
解,得:
2x==[(1-5/12)X+5]*3
2x==[(7x/12)+5]*3
2x==(7x/4)+15
8x==7x+60
x==60
2. 5/4X-75=100
解,得:
5-300x==400x
-700x==-5
x==1/140
3.75-4/6X=0.25
解,得:
22.5x-4==1.5x
21x==4
x==4/21
1. [(1-5/12)X+5]:X=2:3
[(7/12)X+5]:X=2:3
3(7X/12+5)=2x
7x/4-2x=-15
-x/4=-15
x=60
2. 5/4X-75=100
5x/4=175
5x=700
x=140
3.75-4/6X=0.25
450-4x=1.5
4x=450-1.5
40x=4500-15
40x=4485
x=4485/40
1. [(1-5/12)X+5]:X=2:3
2x=3*[7/12x+5]
2x=7/4x+15
1/4x=15
x=60
2. 5/4X-75=100
5/4x=175
x=140
3. 75-4/6X=0.25
4/6x=75-1/4
x=299/4*6/4
x=897/4