数学8道题脱式,简便,方程

数学8道题脱式,简便,方程

1.25×(8+10)

=1.25X8+1.25X10

=10+12.5-22.5

9123－(123+8.8)

=9123-123-8.8

=9000-8.8

=8991.2

1.24X8.3+8.3X1.76

-8.3x(1.24+1.76)=8.3x3=24.9

9999X1001

=9999x(1000+1)=9999X1000+9999X1

=10008999

14.8X6.3-6.3X6.5+8.3X3.7=(14.8-6.5)X6.3+8.3X3.7-8.3X6.3+8.3x3.7

8.3x(6.3+3.7)=8.3X10

=83

1.24+0.788.76=(1.24+8.76)+0.78

=10+0.78

=10.78

933-157-43-933-(157+43)-933-200

=733]

4821-998=4821-1000+2

=3823

i32X125X25

=4X8X125×25

=(4X25)×(8X125)

=100×1000=100000

9048÷268

=(2600+2600+2600+1248)÷26

=2600÷26+2600÷26+2600÷26+1248÷269

=100+100+100+48

=348

2881÷43

=(1290+1591)÷434=1290÷43+1591÷43

=30+37

3.2X42.3X3.75-12.5X0.423X16=3.2X42.3X3.75-1.25X42.3X1.6=42.3x(3.2×3.75-1.25X1.6)

=42.3X(4X0.BX3.75-1.25X4X0.4)=42.3x(4X0.4X2×3.75-1.25X4X0.4)=42.3×(4x04x7.5-1.25x4x0.4)

=42.3x[4x0.4X(7.5-1.25)]

=42.3x[4X0.4X6.25]

=42.3×(4X2.5)

=4237

1.8+18÷1.5-0.5x0.3=1.8+12-0.15

=13.8-0.15

=13.65

6.5X8+3.5X8-47

52+28-47

=80-47

(80-9.8)×5分之2-1,32=70.2X2/5-1.32

=28.08-1.32

=26.76

8X7分之4÷[1÷(3.2-2.95)]=8X4/7÷[1÷0.25]

-8X4/7÷4=8/7

2700x(506-499)÷900