简便运算:25x(5+10);36x34+36x66;125x79 ; 83+83x99;75x101-75;32x4x25

问题描述:

25x(5+10) 36x34+36x66 125x79 83+83x99 75x101-75 32x4x25 125x7x8 25x58x4 678+591+409

四年级 1个回答 分类:数学 2020-03-24

问题解答:

我来补答

25x(5+10)

=(20+5)x15

=300+75

=375

 

36x34+36x66

=36x(34+66)

=36x100

=3600

 

125×79

=125×(80-1)

=125×80-125×1

=10000-125

=9875

 

83+83×99

=83+83×(100-1)

=83×100-83×1

=8300

 

75x101-75

=75x101-75x1

=75x(101-1)

=75x100

=7500

 

32x4x25

=32x(4x25)

=32x100

=3200

 

125x7x8

=(125x8)x7

=1000×7

=7000

 

25x58x4

=25x4x58

=100x58

=5800

 

678+591+409

=678+(591+409)

=678+1000

1678

 
 
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