脱式计算8x(25x15)=(4x2)x(25x15)=(4x25)x(2x15)=100x30=30005x4x5x20=5x5x4x20=25x4x20=100x20=2000420÷18=420÷6÷3=70÷3=70/325x7x4x3=(25x4)x(7x3)=100x21=210015x32x25=15x(4x8)x25=(15x8)x(25x4)=120x100=120003800÷25÷4=3800÷（25x4）=3800÷100=381600÷125÷8=1600÷（125x8）=1600÷1000=1.625x8=25x4x2=100x2=200102x99=102x(100-1)=102x100-102x1=10200-102=10098382x101-382=382x101-382x1=382x(101-1)=382x100=3820035x8-4x35=35x(8-4)=35x4=140136x101-136=136x101-136x1=136x(101-1)=136x100=136004600/25/4=4600/(25x4)=4600/100=4625x15x4=25x4x15=100x15=150099x126=126x(100-1)=126x100-126x1=12600-126=1247410.1*89-8.9=101x8.9-8.9x1=8.9x(101-1)=8.9x100=8909.07-22.78÷3.4=9.07-6.7=9.07-(7-0.3)=9.07-7+0.3=2.07+0.3=2.375+7*(8+12)÷（4-2）=5+7*20÷2=5+70=7516x4+16x6x16=16x4+96x16=16x(4+96)=16x100=16001-1/3-2/3=1-(1/3+2/3)=1-1=0306*3*4 900-25*5 (620+180)*8 72*5÷4...