脱式计算
8x(25x15)
=(4x2)x(25x15)
=(4x25)x(2x15)
=100x30
=3000
5x4x5x20
=5x5x4x20
=25x4x20
=100x20
=2000
420÷18
=420÷6÷3
=70÷3
=70/3
25x7x4x3
=(25x4)x(7x3)
=100x21
=2100
15x32x25
=15x(4x8)x25
=(15x8)x(25x4)
=120x100
=12000
3800÷25÷4
=3800÷(25x4)
=3800÷100
=38
1600÷125÷8
=1600÷(125x8)
=1600÷1000
=1.6
25x8
=25x4x2
=100x2
=200
102x99
=102x(100-1)
=102x100-102x1
=10200-102
=10098
382x101-382
=382x101-382x1
=382x(101-1)
=382x100
=38200
35x8-4x35
=35x(8-4)
=35x4
=140
136x101-136
=136x101-136x1
=136x(101-1)
=136x100
=13600
4600/25/4
=4600/(25x4)
=4600/100
=46
25x15x4
=25x4x15
=100x15
=1500
99x126
=126x(100-1)
=126x100-126x1
=12600-126
=12474
10.1×89-8.9
=101x8.9-8.9x1
=8.9x(101-1)
=8.9x100
=890
9.07-22.78÷3.4
=9.07-6.7
=9.07-（7-0.3）
=9.07-7+0.3
=2.07+0.3
=2.37
5+7×(8+12)÷(4-2)
=5+7×20÷2
=5+70
=75
16x4+16x6x16
=16x4+96x16
=16x(4+96)
=16x100
=1600
1-1/3-2/3
=1-(1/3+2/3)
=1-1
=0
306×3×4
900－25×5
(620＋180)×8
72×5÷4
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