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简便计算.(1)45×45+45×55(2)37×41-37(3)162+89-62.
题目详情
简便计算.
(1)45×45+45×55
(2)37×41-37
(3)162+89-62.
(1)45×45+45×55
(2)37×41-37
(3)162+89-62.
▼优质解答
答案和解析
(1)45×45+45×55
=(45+55)×45,
=100×45,
=4500;
(2)37×41-37
=(41-1)×37,
=40×37,
=1480;
(3)162+89-62
=162-62+89,
=189.
=(45+55)×45,
=100×45,
=4500;
(2)37×41-37
=(41-1)×37,
=40×37,
=1480;
(3)162+89-62
=162-62+89,
=189.
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