178×101-178
=178×(101-1)
=178×100
=17800
83×102-83×2
=83×(102-2)
=83×100
=8300
17×23-23×7
=23×(17-7)
=23×10
=230
158+262+138
=158+(262+138)
=158+400
=558
375+219+318+225
=(375+225)+(219+318)
=600+537
=1137
(181+2564)+2719
=(181+2719)+2564
=2800+2564
=5364
7788-(2187+775)
=7788-1412
=6376
2365-1086-214
=1279-214
=1065
3065-738-1065
=3065-1065-738
=1262
12×25
=3×4×25
=3×100
=300
75×24
=3×25×4×6
=18×100
=1800
138×25×4
=138×100
=13800
7300÷25÷4
=7300÷(25×4)
7300÷100
=73
24×25
=6×4×25
=6×100
=600
88×125
=11×8×125
=11×1000
=11000
35×127-35×16-11×35
=35×(127-16-11)
=35×100
=3500
102×76
=(100+2)×76
=100×76+2×76
=7600+152
=7752
75×99+75
=75×(99+1)
=75×100
=7500
81004÷75
=8100÷(4×75)
=8100÷300
=27
84×36+64×84
=84×(36+64)
=84×100
=8400
83÷102-83×2(这道题有误吧)
25×32×125
=25×4×8×125
=100×1000
=100000
400+612÷12×4
=400+51×4
=400+204
=196
118+153÷17×9
=118+9×9
=118+81
=199