7778乘9999加3333乘6666等于?

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7778乘9999加3333乘6666等于?
7778乘9999加3333乘6666等于? 

7778乘9999加3333乘6666等于?
7778×9999+3333×6666
=7778×9999+9999×2222
=﹙7778+2222﹚×9999
=10000×9999
=99990000

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

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

不知道