题目内容
×+÷13 | 3.8×99+3.8 | 3.2×10.1 |
+-+6.75 | 5-×- | 45×(+-) |
解:(1)×+÷13, =×(), =×1, =; |
=3.8×(99+1),
=3.8×100,
=380;
(3)3.2×10.1,
=3.2×(10+0.1),
=3.2×10+3.2×01,
=32+0.32,
=32.32;
(4)+-+6.75,
=()+(6.75),
=0+7,
=7;
(5)5-×-,
=5-,
=5-(),
=5-1,
=4;
(6)45×(+-),
=45×+45×-45×,
=40+6-27,
=19.
分析:(1)(2)(3)(6)依据乘法分配律解答,
(4)依据加法交换律和加法结合律解答,
(5)依据减法简便运算解答.
点评:本题主要考查学生对于四则运算简便算法掌握.
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