题目内容
解方程
-50%X=
0.4(X+3)=30×
1
÷(X-0.45)=5
.
| 5 |
| 6 |
| 2 |
| 3 |
0.4(X+3)=30×
| 4 |
| 25 |
1
| 3 |
| 5 |
| 1 |
| 3 |
(1)
-50%X=
,
-50%X+50%x=
+50%x,
-
=
+50%x-
,
÷50%=50%x÷50%,
x=
;
(2)0.4(X+3)=30×
,
0.4(X+3)=
,
0.4(X+3)÷0.4=
÷0.4,
x+3=12,
x+3-3=12-3,
x=9;
(3)1
÷(X-0.45)=5
,
1
÷(X-0.45)×(x-0.45)=5
×(x-0.45),
1
=5
x-2.4,
1
+2.4=5
x-2.4+2.4,
4÷5
=5
÷5
,
x=
.
| 5 |
| 6 |
| 2 |
| 3 |
| 5 |
| 6 |
| 2 |
| 3 |
| 5 |
| 6 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 6 |
x=
| 1 |
| 3 |
(2)0.4(X+3)=30×
| 4 |
| 25 |
0.4(X+3)=
| 24 |
| 5 |
0.4(X+3)÷0.4=
| 24 |
| 5 |
x+3=12,
x+3-3=12-3,
x=9;
(3)1
| 3 |
| 5 |
| 1 |
| 3 |
1
| 3 |
| 5 |
| 1 |
| 3 |
1
| 3 |
| 5 |
| 1 |
| 3 |
1
| 3 |
| 5 |
| 1 |
| 3 |
4÷5
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
x=
| 3 |
| 4 |
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