计算下面各题,能简算的要简算.8.5×(2.36+2.42)÷0.253.9÷1.3×64.25×6.3+3.7×4.25205×9925.6-7.49-2.512
答案:2 悬赏:30 手机版
解决时间 2021-04-05 13:28
- 提问者网友:沉默菋噵
- 2021-04-04 20:01
计算下面各题,能简算的要简算. 8.5×(2.36+2.42)÷0.253.9÷1.3×64.25×6.3+3.7×4.25205×9925.6-7.49-2.512.5-(6.8-4.9)×0.8.
最佳答案
- 五星知识达人网友:慢性怪人
- 2021-04-04 21:07
解:(1)8.5×(2.36+2.42)÷0.25,
=8.5×4.78÷0.25,
=40.63÷0.25,
=162.52;
(2)3.9÷1.3×6,
=3×6,
=18;
(3)4.25×6.3+3.7×4.25,
=4.25×(6.3+3.7),
=4.25×10,
=42.5;
(4)205×99,
=205×(100-1),
=205×100-205×1,
=20500-205,
=20295;
(5)25.6-7.49-2.51,
=25.6-(7.49+2.51),
=25.6-10,
=15.6;
(6)2.5-(6.8-4.9)×0.8,
=2.5-1.9×0.8,
=2.5-1.52,
=0.98.解析分析:(1)先算小括号里面的加法,再算括号外的乘法,最后算括号外的除法;
(2)按照从左到右的顺序计算;
(3)运用乘法分配律简算;
(4)先把99分解成100-1,再运用乘法分配律简算;
(5)根据减法的性质简算;
(6)先算小括号里面的减法,再算括号外的乘法,最后算括号外的减法.点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
=8.5×4.78÷0.25,
=40.63÷0.25,
=162.52;
(2)3.9÷1.3×6,
=3×6,
=18;
(3)4.25×6.3+3.7×4.25,
=4.25×(6.3+3.7),
=4.25×10,
=42.5;
(4)205×99,
=205×(100-1),
=205×100-205×1,
=20500-205,
=20295;
(5)25.6-7.49-2.51,
=25.6-(7.49+2.51),
=25.6-10,
=15.6;
(6)2.5-(6.8-4.9)×0.8,
=2.5-1.9×0.8,
=2.5-1.52,
=0.98.解析分析:(1)先算小括号里面的加法,再算括号外的乘法,最后算括号外的除法;
(2)按照从左到右的顺序计算;
(3)运用乘法分配律简算;
(4)先把99分解成100-1,再运用乘法分配律简算;
(5)根据减法的性质简算;
(6)先算小括号里面的减法,再算括号外的乘法,最后算括号外的减法.点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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- 1楼网友:woshuo
- 2021-04-04 21:18
你的回答很对
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