问题
填空题
a×
|
答案
因为a×
+b×1 7
=30,1 7
则:(a+b)×
=30,1 7
(a+b)×
×7=30×7,1 7
(a+b)=210,
(a+b)×2=210×2,
2(a+b)=420;
故答案为:420.
a×
|
因为a×
+b×1 7
=30,1 7
则:(a+b)×
=30,1 7
(a+b)×
×7=30×7,1 7
(a+b)=210,
(a+b)×2=210×2,
2(a+b)=420;
故答案为:420.