(1)0.3+9.7×0.23
(2)91.6-3.8-6.62
(3)1.03×(8.8÷0.25)
(4)2.23×7.5-2.23+3.5×2.23
(5)1.2÷[(5.1-3.6)×0.08]
(6)99.9+9.9+0.9+0.3.
(1)0.3+9.7×0.23(2)91.6-3.8-6.62(3)1.03×(8.8÷0.25)(4)2.23×7.5-2.23+3.5×2.23(5)1.2÷[(
答案:2 悬赏:40 手机版
解决时间 2021-12-20 03:27
- 提问者网友:感性作祟
- 2021-12-19 19:12
最佳答案
- 五星知识达人网友:夜风逐马
- 2021-12-19 20:14
解:(1)0.3+9.7×0.23,
=0.3+2.231,
=2.531;
(2)91.6-3.8-6.62,
=87.8-6.62,
=81.18;
(3)1.03×(8.8÷0.25),
=1.03×35.2,
=36.256;
(4)2.23×7.5-2.23+3.5×2.23,
=2.23×(7.5-1+3.5),
=2.23×10,
=22.3;
(5)1.2÷[(5.1-3.6)×0.08],
=1.2÷[1.5×0.08],
=1.2÷0.12,
=10;
(6)99.9+9.9+0.9+0.3,
=(100-0.1)+(10-0.1)+(1-0.1)+0.1,
=111-0.3+0.3,
=111.解析分析:(1)先算乘法,再算加法;
(2)从左往右依次运算;
(3)先算括号内的,再算括号外的;
(4)运用乘法分配律简算;
(5)先算小括号内的,再算中括号内的,最后算括号外的;
(6)把99.9看作100-0.1,9.9看作10-0.1,0.9看作1-0.1,简算即可.点评:此题考查小数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算律或运算技巧,简便计算.
=0.3+2.231,
=2.531;
(2)91.6-3.8-6.62,
=87.8-6.62,
=81.18;
(3)1.03×(8.8÷0.25),
=1.03×35.2,
=36.256;
(4)2.23×7.5-2.23+3.5×2.23,
=2.23×(7.5-1+3.5),
=2.23×10,
=22.3;
(5)1.2÷[(5.1-3.6)×0.08],
=1.2÷[1.5×0.08],
=1.2÷0.12,
=10;
(6)99.9+9.9+0.9+0.3,
=(100-0.1)+(10-0.1)+(1-0.1)+0.1,
=111-0.3+0.3,
=111.解析分析:(1)先算乘法,再算加法;
(2)从左往右依次运算;
(3)先算括号内的,再算括号外的;
(4)运用乘法分配律简算;
(5)先算小括号内的,再算中括号内的,最后算括号外的;
(6)把99.9看作100-0.1,9.9看作10-0.1,0.9看作1-0.1,简算即可.点评:此题考查小数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算律或运算技巧,简便计算.
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- 1楼网友:天凉才是好个秋
- 2021-12-19 20:33
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