Question

9999*7778+3333*6666 简便计算

过程详细
老师提示我把后边的式子拆一下，与前边的式子结合，可我还是不知道

Answer 1

9999*7778+3333*6666
=9999*7778+3333*3*2222
=9999*7778+9999*2222
=9999*(7778+2222)
=9999*10000
=99990000

你的老师说的是对的，就是把3333*6666拆成3333*3*2222，再变成9999*2222，就和前面有公共项9999了。再用乘法的结合律，提取公共项9999,括号里是2222+7778=10000

Answer 2

上式=2222*9999+9999*7778
=（2222+7778）*9999
=10000*9999
=99990000

Answer 3

9999*7778+3333*6666
=9999*7778+3333*3*2222
=9999*7778+9999*2222
=9999*(7778+2222)
=9999*10000
=99990000

Answer 4

9999*7778+3333*6666
=9999*7778+3333*3*2222
=9999*7778+9999*2222
=9999*(7778+2222)
=9999*10000
=99990000

Answer 5

9999*7778+3333*6666
=9999*7778+3333*3*2222
=9999*7778+9999*2222
=9999*(7778+2222)
=9999*10000
=99990000