题目内容
【题目】解方程
(1)=
,
(2)8(2X﹣7)=5(X+13),
(3)3(x+4.5)=60,
(4)1.6x+2.4=7.52,
(5)3(x﹣0.8)=6.3,
(6)28.4﹣5x=5.8,
【答案】 11 15.5 3.2 2.9 4.52
【解析】
(1)=
,
解:3(6x﹣1)=64,
18x﹣3=64,
18x﹣3+3=64+3,
18x=67,
18x÷18=67÷18,
x=
(2)8(2X﹣7)=5(X+13),
解:16x﹣56=5x+65,
16x﹣56﹣5x=5x+65﹣5x,
11x﹣56=65,
11x﹣56+56=65+56,
11x=121,
11x÷11=121÷11,
x=11,
(3)3(x+4.5)=60,
解:3(x+4.5)÷3=60÷3,
x+4.5=20,
x+4.5﹣4.5=20﹣4.5,
x=15.5
(4)1.6x+2.4=7.52,
解:1.6x+2.4﹣2.4=7.52﹣2.4,
1.6x=5.12,
1.6x÷1.6=5.12÷1.6,
x=3.2;
(5)3(x﹣0.8)=6.3,
解:3x﹣2.4=6.3,
3x﹣2.4+2.4=6.3+2.4,
3x=8.7,
3x÷3=8.7÷3,
x=2.9;
(6)28.4﹣5x=5.8,
解:28.4﹣5x+5x=5.8+5x,
5.8+5x=28.4,
5.8+5x﹣5.8=28.4﹣5.8,
5x=22.6,
5x÷5=22.6÷5,
x=4.52
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