题目内容
X×3
=5
.
1÷(
+X)=5.
50X+30X=400.
| 2 |
| 7 |
| 3 |
| 4 |
1÷(
| 1 |
| 5 |
50X+30X=400.
(1)X×3
=5
,
X×3
÷3
=5
÷3
,
X=
×
,
X=
;
(2)1÷(
+X)=5,
1÷(
+X)×(
+X)=5×(
+X),
1+5x=1,
1+5x-1=1-1,
5x=0,
x=0;
(3)50X+30X=400,
(50+30)X=400,
80X=400,
80X÷80=400÷80,
X=5.
| 3 |
| 7 |
| 3 |
| 4 |
X×3
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 4 |
| 3 |
| 7 |
X=
| 23 |
| 4 |
| 7 |
| 24 |
X=
| 161 |
| 96 |
(2)1÷(
| 1 |
| 5 |
1÷(
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
1+5x=1,
1+5x-1=1-1,
5x=0,
x=0;
(3)50X+30X=400,
(50+30)X=400,
80X=400,
80X÷80=400÷80,
X=5.
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