题目内容
a×
+b×
=30,那么2(a+b)=______.
| 1 |
| 7 |
| 1 |
| 7 |
因为a×
+b×
=30,
则:(a+b)×
=30,
(a+b)×
×7=30×7,
(a+b)=210,
(a+b)×2=210×2,
2(a+b)=420;
故答案为:420.
| 1 |
| 7 |
| 1 |
| 7 |
则:(a+b)×
| 1 |
| 7 |
(a+b)×
| 1 |
| 7 |
(a+b)=210,
(a+b)×2=210×2,
2(a+b)=420;
故答案为:420.
练习册系列答案
相关题目