怎样简便怎样算:
①178.4-45.3-54.7②456-(256-144)③102×45④32×125×25⑤43×99+43⑥(40+8)×25⑦73×99⑧54×11-54.
怎样简便怎样算:①178.4-45.3-54.7②456-(256-144)③102×45④32×125×25⑤43×99+43⑥(40+8)×25⑦73×99⑧54
答案:2 悬赏:30 手机版
解决时间 2021-12-19 02:29
- 提问者网友:回忆在搜索
- 2021-12-18 03:47
最佳答案
- 五星知识达人网友:爱难随人意
- 2021-12-18 04:59
解:(1)178.4-45.3-54.7,
=178.4-(45.3+54.7),
=178.4-100,
=78.4;
(2)456-(256-144),
=456-256-144,
=200-144,
=56;
(3)102×45,
=100×45+2×45,
=4500+90,
=4590;
(4)32×125×25,
=(8×125)×(4×25),
=1000×100,
=100000;
(5)43×99+43,
=(99+1)×43,
=100×43,
=4300;
(6)(40+8)×25,
=40×25+8×25,
=1000+200,
=1200;
(7)73×99,
=73×100-73×1,
=7300-73,
=7227;
(8)54×11-54,
=(11-1)×54,
=10×54,
=540.解析分析:(1)(2)依据减法性质解答;(3)(5)(6)(7)(8)运用乘法分配律解答;(4)化32=4×8,再运用乘法交换律和结合律解答.点评:本题主要考查学生根据题干中各数之间的特点以及关系,正确选择并运用简便算法解决问题的能力.
=178.4-(45.3+54.7),
=178.4-100,
=78.4;
(2)456-(256-144),
=456-256-144,
=200-144,
=56;
(3)102×45,
=100×45+2×45,
=4500+90,
=4590;
(4)32×125×25,
=(8×125)×(4×25),
=1000×100,
=100000;
(5)43×99+43,
=(99+1)×43,
=100×43,
=4300;
(6)(40+8)×25,
=40×25+8×25,
=1000+200,
=1200;
(7)73×99,
=73×100-73×1,
=7300-73,
=7227;
(8)54×11-54,
=(11-1)×54,
=10×54,
=540.解析分析:(1)(2)依据减法性质解答;(3)(5)(6)(7)(8)运用乘法分配律解答;(4)化32=4×8,再运用乘法交换律和结合律解答.点评:本题主要考查学生根据题干中各数之间的特点以及关系,正确选择并运用简便算法解决问题的能力.
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- 1楼网友:患得患失的劫
- 2021-12-18 05:33
你的回答很对
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