怎样简便就怎样算35.6+(12.6-4.4)90÷0.4÷2.50.86×15.4-14.4×0.865.4÷0.6+(2.3-0.46)7.52×10.11.2
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解决时间 2021-03-18 23:40
- 提问者网友:沉默菋噵
- 2021-03-18 11:28
怎样简便就怎样算 35.6+(12.6-4.4)90÷0.4÷2.50.86×15.4-14.4×0.865.4÷0.6+(2.3-0.46)7.52×10.11.25×0.7×0.8.
最佳答案
- 五星知识达人网友:夜余生
- 2020-06-16 16:11
解:(1)35.6+(12.6-4.4),
=35.6+8.2,
=43.8;
(2)90÷0.4÷2.5,
=90÷(0.4×2.5),
=90÷1,
=90;
(3)0.86×15.4-14.4×0.86,
=0.86×(15.4-14.4),
=0.86×1,
=0.86;
(4)5.4÷0.6+(2.3-0.46),
=5.4÷0.6+1.84,
=9+1.84,
=10.84;
(5)7.52×10.1,
=7.52×(10+0.1),
=7.52×10+7.52×0.1,
=75.2+0.752,
=75.952;
(6)1.25×0.7×0.8,
=1.25×0.8×0.7,
=1×0.7,
=0.7.解析分析:(1)先算小括号里面的减法,再算括号外的加法;
(2)根据除法的性质简算;
(3)运用乘法分配律简算;
(4)先算小括号里面的减法,再算括号外的除法,最后算加法;
(5)先把10.1分解成10+0.1,再运用乘法分配律简算;
(6)根据乘法交换律简算.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.
=35.6+8.2,
=43.8;
(2)90÷0.4÷2.5,
=90÷(0.4×2.5),
=90÷1,
=90;
(3)0.86×15.4-14.4×0.86,
=0.86×(15.4-14.4),
=0.86×1,
=0.86;
(4)5.4÷0.6+(2.3-0.46),
=5.4÷0.6+1.84,
=9+1.84,
=10.84;
(5)7.52×10.1,
=7.52×(10+0.1),
=7.52×10+7.52×0.1,
=75.2+0.752,
=75.952;
(6)1.25×0.7×0.8,
=1.25×0.8×0.7,
=1×0.7,
=0.7.解析分析:(1)先算小括号里面的减法,再算括号外的加法;
(2)根据除法的性质简算;
(3)运用乘法分配律简算;
(4)先算小括号里面的减法,再算括号外的除法,最后算加法;
(5)先把10.1分解成10+0.1,再运用乘法分配律简算;
(6)根据乘法交换律简算.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:笑迎怀羞
- 2020-09-07 10:44
谢谢回答!!!
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