9999 X 2222 + 3333 X 3334
= 3333 X 6666 + 3334 X 3333
= 3333 X ( 6666 + 3334 )
= 3333 X ( 9999 + 1 )
= 3333 X 10000
= 3333 00009999 X 2222= 9999 X 3/3 X 2222= 9999 / 3 X 2222= 3333 X 6666或者分析因数18 = 9 X 2 = 3 X 3 X 2 = 3 X 69999 X 2222= 9999 X 3/3 X 2222= 9999 / 3 X 2222 X 3= 3333 X 6666或者,分析因数9 X 2 = 3 X 3 X 2 = 3 X 6