下面各题怎样简便就怎样计算9.9×25 0.75×0.5×4×0.2 1.25×32×0.25 8.12×4+1.88×4 0.32×13.4-0.32
下面各题怎样简便就怎样计算9.9×250.75×0.5×4×0.21.25×32×0.258.12×4+1.88×40.32×13.4-0.32×3.43.84×99+3...
下面各题怎样简便就怎样计算9.9×25 0.75×0.5×4×0.2 1.25×32×0.25 8.12×4+1.88×4 0.32×13.4-0.32×3.4 3.84×99+3.84 2.009×390+20.09×41+200.9×2 (9.57+9.57+9.57+9.57)×25.
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(1)9.9×25, =(10-0.1)×25, =10×25-0.1×25, =250-2.5, =247.5; (2)0.75×0.5×4×0.2, =(0.75×4)×(0.5×0.2), =3×0.1, =0.3; (3)1.25×32×0.25, =1.25×8×4×0.25, =(1.25×8)×(0.25×4), =10×1, =10; (4)8.12×4+1.88×4, =(8.12+1.88)×4, =10×4, =40; (5)0.32×13.4-0.32×3.4, =0.32×(13.4-3.4), =0.32×10, =3.2; (6)3.84×99+3.84, =3.84×(99+1), =3.84×100, =384; (7)2.009×390+20.09×41+200.9×2, =20.09×39+20.09×41+20.09×20, =20.9×(39+41+20), =20.9×100, =2090; (8)(9.57+9.57+9.57+9.57 )×25, =(9.57×4)×25, =9.57×(4×25), =9.57×100, =957. |
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