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求未知数x.1-85%x=0.15(x+1)+2(x+1)+3(x+1)=24.
题目详情
求未知数x.
1-85%x=0.15
(x+1)+2(x+1)+3(x+1)=24.
1-85%x=0.15
(x+1)+2(x+1)+3(x+1)=24.
▼优质解答
答案和解析
(1)1-85%x=0.15,
1-0.85x=0.15,
1-0.85x+0.85x=0.15+0.85x,
0.15+0.85x=1,
0.15+0.85x-0.15=1-0.15,
0.85x÷0.85=0.85÷0.85;
x=1;
(2)(x+1)+2(x+1)+3(x+1)=24,
x+1+2x+2+3x+3=24,
6x+6=24,
6×(x+1)=24,
6×(x+1)÷6=24÷6,
x+1=4,
x+1-1=4-1,
x=3.
1-0.85x=0.15,
1-0.85x+0.85x=0.15+0.85x,
0.15+0.85x=1,
0.15+0.85x-0.15=1-0.15,
0.85x÷0.85=0.85÷0.85;
x=1;
(2)(x+1)+2(x+1)+3(x+1)=24,
x+1+2x+2+3x+3=24,
6x+6=24,
6×(x+1)=24,
6×(x+1)÷6=24÷6,
x+1=4,
x+1-1=4-1,
x=3.
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