5×0.7+40%(x+5)等于25.5
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答案50,x=50,解:3.5+0.4(x+5)=25.5,3.5+0.4x+2=25.5,0.4x+5.5=25.5,0.4x+5.5-5.5=25.5,0.4x=20,0.4x➗0.4=20➗0.4,x=50,方程的解是x=50
咨询记录 · 回答于2023-01-01
5×0.7+40%(x+5)等于25.5
答案50,x=50,解:3.5+0.4(x+5)=25.5,3.5+0.4x+2=25.5,0.4x+5.5=25.5,0.4x+5.5-5.5=25.5,0.4x=20,0.4x➗0.4=20➗0.4,x=50,方程的解是x=50
答案50,x=50,解:3.5+0.4(x+5)=25.5,3.5+0.4x+2=25.5,0.4x+5.5=25.5,0.4x+5.5-5.5=25.5,0.4x=20,0.4x➗0.4=20➗0.4,x=50,方程的解是x=50
2咋来的
40%=0.4,然后去括号,0.4x5=2