简便计算:0.9乘72乘1.25 98+1002+998+102 32乘七分之五+七分之五乘32 68-59+99+101
问题描述:
简便计算:0.9乘72乘1.25 98+1002+998+102 32乘七分之五+七分之五乘32 68-59+99+101
答
0.9*72*1.25=0.9*9*8*0.125=0.9*9*1=0.8198+1002+998+102=(98+2)+(1002-2)+(998+2)+(102-2)=100+1000+1000+100=220032*5/7+32*5/7=(32+32)*5/7=320/768-59+99+101=(68+2)-(59+1)+(99+101)-2+1=70-60+200-1=2...