题目内容
①2x+4
| ②2x+5
| ||||||
| ③0.4×6+3x=4.8 | ④9x-2.7÷0.03=0. |
(1)2x+4
=4.875,
2x+4
-4.875=4.875-4.875,
2x=0,
2x÷2=0÷2,
x=0,
(2)2x+5
=10-3
,
2x+5
-5
=6
-5
,
2x=1,
2x÷2=1÷2,
x=
,
(3)0.4×6+3x=4.8,
2.4+3x=4.8,
2.4+3x-2.4=4.8-2.4,
3x=2.4,
3x÷3=2.4÷3,
x=0.8,
(4)9x-2.7÷0.03=0,
9x-90=0,
9x-90+90=0+90,
9x=90,
9x÷9=90÷9,
x=10.
| 7 |
| 8 |
2x+4
| 7 |
| 8 |
2x=0,
2x÷2=0÷2,
x=0,
(2)2x+5
| 1 |
| 5 |
| 4 |
| 5 |
2x+5
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
2x=1,
2x÷2=1÷2,
x=
| 1 |
| 2 |
(3)0.4×6+3x=4.8,
2.4+3x=4.8,
2.4+3x-2.4=4.8-2.4,
3x=2.4,
3x÷3=2.4÷3,
x=0.8,
(4)9x-2.7÷0.03=0,
9x-90=0,
9x-90+90=0+90,
9x=90,
9x÷9=90÷9,
x=10.
练习册系列答案
相关题目