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2.5×3.2×1.25用脱式计算

2.5×1.25×32 =2.5×4×1.25×8 =10×10 =100

32x2.5x1.25脱式计算 =8x4x2.5x1.25 =(8x1.25)x(4x2.5) =10x10 =100

0.25X3.2X1.25 =0.25X4X0.8X1.25 =1X1=1

1.25/1.2 9.3脱式计算 1.25/1.2+9.3 =25/24+9又3/10 =125/120+9又36/120 =10又41/120

脱式计算能简算的要简算2.5×1.6×1.25 2.5×1.6×1.25 =2.5×2×0.8×1.25 =5×1 =5

1.25×8.2 =1.25×(8+0.2) =1.25×8+1.25×0.2 =10+0.25 =10.25

(1)0.25×1.25×4×8,=(0.25×4)×(1.25×8),=1×10,=10;(2)2.125×14+1.875÷4,=(2.125+1.875)×14,=4×14,=1;(3)(2.5-0.125)×0.8+6.24,=2.5×0.8-0.125×0.8+6.24,=2-0.1+6.24,=8.14,(4)2÷23-23÷2,=2×32-23×12,=3-13,=223;...

2.5×1.6×1.25 =2.5x(1+0.6)x1.25 =(2.5+2.5x0.6)x1.25 =(2.5+1.5)x1.25 =4x1.25 =5

(1)1305-386-614,=1305-(386+614),=1305-1000,=305;(2)(14+23-56)×12,=14×12+23×12-56×12,=3+8-10,=1; (3)1.25×32×2.5,=(1.25×8)×(4×2.5),=10×10,=100;(4)10.9-(45+9.6÷4),=10.9-(45+2.4),=10.9-3.2,=7.7.

1.25×0.8×3.37 =1×3.37 =3.37

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