计算下面各题,能用简便算法的就用简便算法.
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解:(1),
=(),
=,
=;
(2)(18+)×,
=18×+,
=14+,
=14;
(3),
=(),
=1,
=;
(4)10-,
=(10-1),
=9,
=8;
(5)(),
=,
=,
=;
(6)17,
=()×(17),
=7,
=1.
解析分析:(1)运用乘法结合律解答,
(2)(3)(4)(5)运用乘法分配律解答,
(6)运用乘法交换律和结合律解答.
点评:解答本题要观察算式中各数的关系,选择并运用正确简便算法解答.