简便运算:25x(5+10);36x34+36x66;125x79 ; 83+83x99;75x101-75;32x4x25
2023-04-27
问题描述:
25x(5+10) 36x34+36x66 125x79 83+83x99 75x101-75 32x4x25 125x7x8 25x58x4 678+591+409
最佳答案:
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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