题目内容
| 解方程 ①10x-6.5=73.5 | ②23x÷1.2=115 | ③2.4÷(x-15)=12 | ||
| ④4x-2x=164 | ⑤0.5×(7.6-x)=0 | ⑥(1-
|
(1)10x-6.5=73.5,
10x-6.5+6.5=73.5+6.5,
10x÷10=80÷10,
x=8;
(2)23x÷1.2=115,
23x÷1.2×1.2=115×1.2,
23x÷23=138÷23,
x=6;
(3)2.4÷(x-15)=12,
2.4÷(x-15)×(x+15)=12×(x-15),
12×(x-15)=24,
12×(x-15)÷12=24÷12,
x-15=2,
x-15+15=2+15,
x=17;
(4)4x-2x=164,
2x=164,
2x÷2=164÷2,
x=82;
(5)0.5×(7.6-x)=0
0.5×(7.6-x)÷0.5=0÷0.5,
7.6-x+x=0+x,
x=7.6;
(6)(1-
)x=210,
x=210,
x×
=210×
,
x=240.
10x-6.5+6.5=73.5+6.5,
10x÷10=80÷10,
x=8;
(2)23x÷1.2=115,
23x÷1.2×1.2=115×1.2,
23x÷23=138÷23,
x=6;
(3)2.4÷(x-15)=12,
2.4÷(x-15)×(x+15)=12×(x-15),
12×(x-15)=24,
12×(x-15)÷12=24÷12,
x-15=2,
x-15+15=2+15,
x=17;
(4)4x-2x=164,
2x=164,
2x÷2=164÷2,
x=82;
(5)0.5×(7.6-x)=0
0.5×(7.6-x)÷0.5=0÷0.5,
7.6-x+x=0+x,
x=7.6;
(6)(1-
| 1 |
| 8 |
| 7 |
| 8 |
| 7 |
| 8 |
| 8 |
| 7 |
| 8 |
| 7 |
x=240.
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