计算,能用简算的要简算.
0.85×101????????????????
5.29÷2.3-0.1×01
0.28÷35??????????????
8-4.68÷4.5×(0.25+0.5)
2.5×1.25×32??????????????
25.7×3.29+6.71×25.7.
计算,能用简算的要简算.0.85×101????????????????5.29÷2.3-0.1×010.28÷35??????????????8-4.68÷4.5×
答案:2 悬赏:10 手机版
解决时间 2021-04-13 16:31
- 提问者网友:几叶到寒
- 2021-04-13 01:34
最佳答案
- 五星知识达人网友:逃夭
- 2021-04-13 02:21
解:(1)0.85×101,
=0.85×(100+1),
=0.85×100+0.85×1,
=85+0.85,
=85.85;
(2)5.29÷2.3-0.1×01,
=2.3-0.01,
=2.29;
(3)0.28÷35,
=0.28÷7÷5,
=0.04÷5,
=0.008;??????????????
(4)8-4.68÷4.5×(0.25+0.5).
=8-4.68÷4.5×0.75,
=8-1.04×0.75,
=8-0.78,
=7.22;
(5)2.5×1.25×32,
=(2.5×4)×(1.25×8),
=10×10,
=100;
(6)25.7×3.29+6.71×25.7,
=25.7×(3.29+6.71),
=25.7×10,
=257.解析分析:(1)(6)根据乘法分配律简便计算;
(2)先算乘除,再算减法;
(3)变形为0.28÷7÷5,简算即可;??????????????
(4)先算括号里面的,再算括号外面的;
(5)变形为(2.5×4)×(1.25×8),简算即可求解.点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
=0.85×(100+1),
=0.85×100+0.85×1,
=85+0.85,
=85.85;
(2)5.29÷2.3-0.1×01,
=2.3-0.01,
=2.29;
(3)0.28÷35,
=0.28÷7÷5,
=0.04÷5,
=0.008;??????????????
(4)8-4.68÷4.5×(0.25+0.5).
=8-4.68÷4.5×0.75,
=8-1.04×0.75,
=8-0.78,
=7.22;
(5)2.5×1.25×32,
=(2.5×4)×(1.25×8),
=10×10,
=100;
(6)25.7×3.29+6.71×25.7,
=25.7×(3.29+6.71),
=25.7×10,
=257.解析分析:(1)(6)根据乘法分配律简便计算;
(2)先算乘除,再算减法;
(3)变形为0.28÷7÷5,简算即可;??????????????
(4)先算括号里面的,再算括号外面的;
(5)变形为(2.5×4)×(1.25×8),简算即可求解.点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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- 1楼网友:渡鹤影
- 2021-04-13 03:10
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