题目内容
解方程
5
| 4x+0.4x=70.4 | 3x+90%×4=9 | (1+40%)x=98. |
(1)5
x-120%x=6.5,
4.2x=6.5,
4.2x÷4.2=6.5÷4.2,
x=
;
(2)4x+0.4x=70.4,
4.4x=70.4,
4.4x÷4.4=70.4÷4.4,
x=16;
(3)3x+90%×4=9,
3x+3.6=9,
3x+3.6-3.6=9-3.6,
3x=5.4,
3x÷3=5.4÷3
x=1.8;
(4)(1+40%)x=98,
1.4x=98,
1.4x÷1.4=98÷1.4,
x=70.
| 2 |
| 5 |
4.2x=6.5,
4.2x÷4.2=6.5÷4.2,
x=
| 65 |
| 42 |
(2)4x+0.4x=70.4,
4.4x=70.4,
4.4x÷4.4=70.4÷4.4,
x=16;
(3)3x+90%×4=9,
3x+3.6=9,
3x+3.6-3.6=9-3.6,
3x=5.4,
3x÷3=5.4÷3
x=1.8;
(4)(1+40%)x=98,
1.4x=98,
1.4x÷1.4=98÷1.4,
x=70.
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