题目内容
求未知数:
120+
x=168
5(2x+33)=195
=0.12:1.5.
120+
| 5 |
| 9 |
5(2x+33)=195
| 6.4 |
| x |
(1)120+
x=168,
120+
x-120=168-120,
x=48,
x×
=48×
,
x=86.4;
(2)5×(2x+33)=195,
5×(2x+33)÷5=195÷5,
2x+33=39,
2x+33-33=39-33,
2x=6,
2x÷2=6÷2,
x=3;
(3)
=0.12:1.5,
0.12x=6.4×1.5,
0.12x÷0.12=6.4×1.5÷0.12,
x=80.
| 5 |
| 9 |
120+
| 5 |
| 9 |
| 5 |
| 9 |
| 5 |
| 9 |
| 9 |
| 5 |
| 9 |
| 5 |
x=86.4;
(2)5×(2x+33)=195,
5×(2x+33)÷5=195÷5,
2x+33=39,
2x+33-33=39-33,
2x=6,
2x÷2=6÷2,
x=3;
(3)
| 6.4 |
| x |
0.12x=6.4×1.5,
0.12x÷0.12=6.4×1.5÷0.12,
x=80.
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