4x-3(2-x)=5x-7(3-x)解方程.

问题描述:

4x-3(2-x)=5x-7(3-x)解方程.
15-(7-5x)=2x+(5-3x)
3/4[4/3(1/2t-1/4)-8]=3/2t-1


4x-3(2-x)=5x-7(3-x)
4x-6+3x=5x-21+7x
7x-6=12x-21
5x=15
x=3
15-(7-5x)=2x+(5-3x)
15-7+5x=2x+5-3x
8+5x=-x+5
6x=-3
x=-1/2
3/4[4/3(1/2t-1/4)-8]=3/2t-1
3/4*4/3(1/2t-1/4)-3/4*8=3/2t-1
1/2t-1/4-6=3/2t-1
-t=5又1/4
t==-5又1/4
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