2y-1)30%+(y+5)20%=15x25%这道题怎么做?3(3-2x)+2(2x-3)=3(2x-3)=4

问题描述:

2y-1)30%+(y+5)20%=15x25%这道题怎么做?3(3-2x)+2(2x-3)=3(2x-3)=4

(2y-1)30%+(y+5)20%=15×25%
0.3(2y-1)+0.2(y+5)=15×0.25
0.6y-0.3+0.2y+1=3.75
0.8y+0.7=0.75
0.8y=3.75-0.7
0.8y=3.05
y=3.05÷0.8
y=0.38125
第二题看不懂!