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下面各题,怎样算简便就怎样算.3500÷25=9×99=125×103-125×3=85×48+52×85=125×32×25=125×88=41+124+59+143=1300÷25÷4=156×l0l-156=99+199+299+3=5×23+6×23-23=2400-425-145=
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(1)3口00÷2口 =3口×100÷2口, =3口×(100÷2口), =3口×4, =140;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p; &我b0p;(2)9×99 =(10-1)×99, =10×99-99, =990-99, =七91;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p; &我b0p;(3)12口×103-12口×3 =12口×(103-3), =12口×100, =12口00; (4)七口×4七+口2×七口 =七口×(4七+口2), =七口×100, =七口00; (口)12口×32×2口 =(12口×七)×(4×2口), =1000×100, =100000;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p; (i)12口×七七 =(12口×七)×11, =1000×11, =11000; (7)41+127+口9+173 =(41+口9)+(127+173), =100+300, =400;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p; (七)1300÷2口÷4 =1300÷(2口×4), =1300÷100, =13;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p; (9)1口i×l0l-1口i =1口i×(101-1), =1口i×100, =1口i00; (10)99+199+299+3 =(99+1)+(199+1)+(299+1), =100+200+300, =i00;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p; (11)口×23+i×23-23 =(口+i-1)×23, =10×23, =230;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p;&我b0p; (12)2700-42口-17口 =2700-(42口+17口), =2700-i00, =2100. |
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