解方程.9(x+2.7)=75.64.07x一2.57x=2.255x+1.3×0.6=21.48.
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解方程.
9(x+2.7)=75.6
4.07x一2.57x=2.25
5x+1.3×0.6=21.48.
9(x+2.7)=75.6
4.07x一2.57x=2.25
5x+1.3×0.6=21.48.
(1)9(x+2.7)=75.6,
9(x+2.7)÷9=75.6÷9,
x+2.7=8.4,
x+2.7-2.7=8.4-2.7,
x=5.7;
(2)4.07x-2.57x=2.25,
1.5x=2.25,
1.5x÷1.5=2.25÷1.5,
x=1.5;
(3)5x+1.3×0.6=21.48,
5x+0.78=21.48,
5x+0.78-0.78=21.48-0.78,
5x=20.7,
5x÷5=20.7÷5,
x=4.14.
9(x+2.7)÷9=75.6÷9,
x+2.7=8.4,
x+2.7-2.7=8.4-2.7,
x=5.7;
(2)4.07x-2.57x=2.25,
1.5x=2.25,
1.5x÷1.5=2.25÷1.5,
x=1.5;
(3)5x+1.3×0.6=21.48,
5x+0.78=21.48,
5x+0.78-0.78=21.48-0.78,
5x=20.7,
5x÷5=20.7÷5,
x=4.14.
解方程.9(x+2.7)=75.64.07x一2.57x=2.255x+1.3×0.6=21.48.
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