748-351+252-149简便法运算
问题描述:
748-351+252-149简便法运算
答
748-351+252-149
=(748+252)-(351+149)
=1000-500
=500
答
(750+250-350-150)+(2-1+2+1)=504
答
(750-2+250+2)-(350+1+150-1)
=1000-500
=500
答
748+252-(351+149)=1000-500=500
答
=748+252-351-149
=1000-(351+149)
=1000-500
=500