题目内容
【题目】解方程
(1)﹣=1,
(2)4x﹣5×6=12,
(3)8x﹣3x=15.6,
(4)30×(x÷4)=60,
(5)7.2×0.5﹣3x=1.2,
(6)5x﹣2.4×5=8,
【答案】3 10.5 3.12 8 0.8 4
【解析】
(1)﹣=1,
解:(﹣)×24=1×24,
6(y+2)﹣4(2y﹣3)=24,
30﹣2y=24,
30﹣2y+2y=24+2y,
2y+24=30,
2y+24﹣24=30﹣24,
2y=6,
2y÷2=6÷2,
y=3
(2)4x﹣5×6=12,
解:4x﹣30=12,
4x﹣30+30=12+30,
4x=42,
4x÷4=42÷4,
x=10.5;
(3)8x﹣3x=15.6,
解:5x=15.6,
5x÷5=15.6÷5,
x=3.12;
(4)30×(x÷4)=60,
解:30×(x÷4)÷30=60÷30,
x÷4=2,
x÷4×4=2×4,
x=8;
(5)7.2×0.5﹣3x=1.2,
解:3.6﹣3x=1.2,
3.6﹣3x+3x=1.2+3x,
3x+1.2=3.6,
3x+1.2﹣1.2=3.6﹣1.2,
3x=2.4,
3x÷3=2.4÷3,
x=0.8
(6)5x﹣2.4×5=8,
解:5x﹣12+12=8+12,
5x=20,
5x÷5=20÷5,
x=4,
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