怎么做?用简便丰富计算
2个回答
展开全部
5又7分之3×0.5÷5又7分之3×0.5
=5又7分之3÷5又7分之3×0.5×0.5
=1×0.5×0.5
=0.25
(5又9分之5-0.8+2又9分之4)×12.5
=(8-0.8)×12.5
=8×12.5-0.8×12.5
=100-10
=90
999×1999+999
=999×(1999+1)
=999×2000
=(1000-1)×2000
=1000×2000-1×2000
=2000000-2000
=1998000
(5/6+7/8-5/12)÷1/24
=(5/6+7/8-5/12)×24
=20+21-10
=31
=5又7分之3÷5又7分之3×0.5×0.5
=1×0.5×0.5
=0.25
(5又9分之5-0.8+2又9分之4)×12.5
=(8-0.8)×12.5
=8×12.5-0.8×12.5
=100-10
=90
999×1999+999
=999×(1999+1)
=999×2000
=(1000-1)×2000
=1000×2000-1×2000
=2000000-2000
=1998000
(5/6+7/8-5/12)÷1/24
=(5/6+7/8-5/12)×24
=20+21-10
=31
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