题目内容
解方程.
| (1)1.4X-9.8=22.4 | (2)2(X-3)=11.6 |
| (3)13X-X=144 | (4)5.4X+X=12.8. |
(1)1.4X-9.8=22.4
1.4x-9.8+9.8=22.4+9.8,
1.4x÷1.4=32.2÷1.4,
x=23;
(2)2(X-3)=11.6
2(x-3)÷2=11.6÷2,
x-3=5.8
x-3+3=5.8+3,
x=8.8;
(3)13X-X=144,
12X=144,
12X÷12=144÷12,
X=12;
(4)5.4X+X=12.8,
6.4X=12.8,
6.4X÷6.4=12.8÷6.4,
X=2.
1.4x-9.8+9.8=22.4+9.8,
1.4x÷1.4=32.2÷1.4,
x=23;
(2)2(X-3)=11.6
2(x-3)÷2=11.6÷2,
x-3=5.8
x-3+3=5.8+3,
x=8.8;
(3)13X-X=144,
12X=144,
12X÷12=144÷12,
X=12;
(4)5.4X+X=12.8,
6.4X=12.8,
6.4X÷6.4=12.8÷6.4,
X=2.
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