题目内容
下面各题,怎样简便怎样算. 645-268-32 |
466-(66+125) |
824-224-176-124 | 521-64-36. |
分析:(1)645-268-32,根据减法的运算性质:a-b-c=a-(b+c),据此简算;
(2)466-(66+125),根据减法的运算性质进行简算;
(3)824-224-176-124,根据减法的运算性质进行简算;
(4)521-64-36,根据减法的运算进行简算.
(2)466-(66+125),根据减法的运算性质进行简算;
(3)824-224-176-124,根据减法的运算性质进行简算;
(4)521-64-36,根据减法的运算进行简算.
解答:解:(1)645-268-32,
=645-(268+32),
=645-300,
=345;
(2)466-(66+125),
=466-66-125,
=400-125,
=275;
(3)824-224-176-124,
=600-(176+124),
=600-300,
=300;
(4)521-64-36,
=521-(64+36),
=521-100,
=421.
=645-(268+32),
=645-300,
=345;
(2)466-(66+125),
=466-66-125,
=400-125,
=275;
(3)824-224-176-124,
=600-(176+124),
=600-300,
=300;
(4)521-64-36,
=521-(64+36),
=521-100,
=421.
点评:此题考查的目的是理解掌握减法的运算性质:a-b-c=a-(b+c),并且能够灵活运用这一性质进行简便计算.
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