(4)3-1/5(5-2y)=4-1/10(4-7y)+1/2(y+2)过程得有~~快!

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(4)3-1/5(5-2y)=4-1/10(4-7y)+1/2(y+2)过程得有~~快!(4)3-1/5(5-2y)=4-1/10(4-7y)+1/2(y+2)过程得有~~快!(4)3-1/5(5-2

(4)3-1/5(5-2y)=4-1/10(4-7y)+1/2(y+2)过程得有~~快!
(4)3-1/5(5-2y)=4-1/10(4-7y)+1/2(y+2)
过程得有~~快!

(4)3-1/5(5-2y)=4-1/10(4-7y)+1/2(y+2)过程得有~~快!
3-1/5(5-2y)=4-1/10(4-7y)+1/2(y+2)
3-1+2/5y=4-2/5+7/10y+1/2y+1
7/10y+1/2y-2/5y=2-4.6
4/5y=-2.6
y=-3.25

等式两边同乘10得
30-2(5-2y)=40-(4-7y)+5(y+2)
30-10+4y=40-4+7y+5y+10
8y=-26
y=-13/4

(4)3-1/5(5-2y)=4-1/10(4-7y)+1/2(y+2)
3-1+2/5y=4-2/5+7/10y+1/2y+1
2/5y-7/10y-1/2y=2.6
-0.8y=2.6
y=-3.25