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5392+3997 7362-2999 62.4÷2.5÷0.4 125÷(50÷8) 55×0.99 7.2×10.1

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/11/09 09:54:13
5392+3997 7362-2999 62.4÷2.5÷0.4 125÷(50÷8) 55×0.99 7.2×10.1 8÷125 的简便计算
还有一题 12.5×56 3.72-(1.72+1.7) .拜托了、今天就要..呜呜、
5392+3997
=5392+4000-3
=9392-3
=9389
7362-2999
=7362-3000+1
=3362+1
=3363
62.4÷2.5÷0.4
=62.5/(2.5*4)
=62.5*10
=625
125÷(50÷8)
=125*8/50
=1000/50
=20
55×0.99
=55*(1-0.01)
55*1-55-0.01
=55-0.55
=54.45

7.2×10.1
=7.2*(10+0.1)
=7.2*10+7.2*0.1
=72+0.72
=72.72
8÷125
=(2*2*2)/(5*5*5)
=(2/5)*(2/5)*(2/5)
=0.4*0.4*0.4
=0.064
12.5×56
=12.5*8*7
=100*7
=700
3.72-(1.72+1.7)
=(3.72-1.72)-1.7
=2-1.7
=0.3