3333x9999的简便运算
3333x9999的简便运算 -
=2*3333*(3334-1)=2*3333*3334-2*3333*1 =2*11112222-6666 =22224444-6666 =22217778 (记住这个规律:3*4=12;33*34=1122;333*334=111222……
78x9999+66x3333 =78*9999+22*3*3333 =78*9999+22*9999 =(78+22)9999 =100*9999 =999900
=2*3333*(3334-1)=2*3333*3334-2*3333*1 =2*11112222-6666 =22224444-6666 =22217778 (记住这个规律:3*4=12;33*34=1122;333*334=111222……
78x9999+66x3333 =78*9999+22*3*3333 =78*9999+22*9999 =(78+22)9999 =100*9999 =999900
899x99=(899+1)(99+1)-899-99-1=90000-999=89001 7.4*9.9+0.74=0.74x(99+1)=74 第三题我有误解太多除号连着你得加几个刮号才行设11111为X 9x*2x+3x*(3x+1)=18x^2+9x^2+3x=3x(1+9x)=33333x100000=3333300000 30.7-0.12*2-0.76=30.7-(0.24+0.76)=29.7 好了吧!
=(8888÷2222)×(9999÷3333)=4×3 =12