问题
解答题
用简便方法计算:
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答案
①45×98+45×2,
=45×(98+2),
=45×100,
=4500;
②452-(152+240),
=452-152-240,
=60;
③99×27,
=(100-1)×27,
=2700-27,
=2673;
④1120÷16÷7,
=1120÷(16×7),
=1120÷112,
=10;
⑤113×36-13×36,
=36×(113-13),
=36×100,
=3600;
⑥179-245+321-155,
=(179+321)-(245+155),
=400-400,
=0.