5175除以207加102乘以9
=5175除以3÷69加100乘以9+2×9
=1725÷69+900+18
=25+918
=943
520-108÷9×24
=520-12×24
=520-(10+2)×24
=520-10×24-2×24
=520-240-48
=232
5.1除以4加4.9乘以25%
=5.1/4+4.9*1/4
=1/4(5.1+4.9)
=1/4*10=2.5
5乘以38减42除以7乘以9,用简便方法怎样计
5乘以38减42除以7乘以9,
=5*38-42÷7*9
=190-54
=136
785×102
=785×100+785×2
=78500+1570
=80070
0.36×102
=0.36×100+0.36×2
=36+0.72
=36.72
63×22÷9-7×22
=63÷9×22-7×22
=7×22-7×22
=0
14.74*0.682/68=14.74*(0.682/68)
≈14.74*0.01
≈0.15
数据运算规则, 乘除法:当几个数据相乘除时,它们积或商的有效数字位数,应以有效数字位数最少的数据为依据。
14.8÷(1.48X4)
=1.48÷1.48÷4
=1/4
88÷72×36÷11
=88÷11×36÷72
=8×1/2
=4
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