7778乘以负的9999加负的3333乘以6666

问题描述:

7778乘以负的9999加负的3333乘以6666

-99990000

7778×(-9999)+(-3333)×6666
= (-9999)×7778+(-3333×3)×(6666÷3)
= (-9999)×7778+(-9999)×2222
= (-9999)×(7778+2222)
= (-9999)×10000
= -99990000