Question

把83看作83x1用乘法分配律83+83x99

几道题帮我做（提示：把83看做83x1,再用乘法分配率）
83+83x99(几个等于都行） 56+56x99 99x99+99 75x101-75 125x81-125 91x31-91
=
=

Answer 1

83+83×99
=83×(1+99)
=83×100
=8300
56+56×99
=56×(1+99)
=56×100
=5600
99×99+99
=99×(99+1)
=99×100
=9900
75×101-75
= 75×(101-1)
= 75×100
= 7500
125×81-125
=125×(81-1)
=125×80
=10000
91×31-91
=91×(31-1)
=91×30
=30×(90+1)
=2700+30
=2730