题目内容
x-(
| 2x+
| ||||||||||
| 15x-4.5×2=51 | 7x+3x+26=74 | ||||||||||
| 5.6x-x=41 | 6.3×0.7+4x=6.5. |
(1)x-(
+
)=
x-1=
x-1+1=
+1
x=1
;
(2)2x+
=
2x+
-
=
-
2x÷2=0÷2
x=0;
(3)15x-4.5×2=51
15x-9+9=51+9
15x÷15=60÷15
x=4;
(4)7x+3x+26=74
10x+26-26=74-26
10x÷10=48÷10
x=4.8;
(5)5.6x-x=41
4.6x=41
4.6x÷4.6=41÷4.6
x=8
;
(6)6.3×0.7+4x=6.5
4.41+4x-4.41=6.5-4.41
4x÷4=2.09÷4
x=0.5225.
| 1 |
| 3 |
| 2 |
| 3 |
| 7 |
| 12 |
x-1=
| 7 |
| 12 |
x-1+1=
| 7 |
| 12 |
x=1
| 7 |
| 12 |
(2)2x+
| 7 |
| 9 |
| 7 |
| 9 |
2x+
| 7 |
| 9 |
| 7 |
| 9 |
| 7 |
| 9 |
| 7 |
| 9 |
2x÷2=0÷2
x=0;
(3)15x-4.5×2=51
15x-9+9=51+9
15x÷15=60÷15
x=4;
(4)7x+3x+26=74
10x+26-26=74-26
10x÷10=48÷10
x=4.8;
(5)5.6x-x=41
4.6x=41
4.6x÷4.6=41÷4.6
x=8
| 21 |
| 23 |
(6)6.3×0.7+4x=6.5
4.41+4x-4.41=6.5-4.41
4x÷4=2.09÷4
x=0.5225.
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