简便计算1、9999*7778+6666 2、(425*5775+4225*425)÷125÷8
问题描述:
简便计算1、9999*7778+6666 2、(425*5775+4225*425)÷125÷8
答
1 9999X7778+3333X6666 =3333x3x7778+3333x3x2222 =3333x3(7778+2222) =9999x10000 =999900002(425×5775+4225×425)÷125÷8= 425×(5775+4225)÷(125×8)= 425×10000÷1000= 425×(10000÷1000)= 425×10= 4250