问题 解答题
用简便方法计算:
45×98+45×2452-(152+240)99×27
1120÷16÷7113×36-13×36179-245+321-155.
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.

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