3*999+3+99*8+8+2*9+9+2的简便运算
问题描述:
3*999+3+99*8+8+2*9+9+2的简便运算
答
3.
a+b=2
ab=-4
a^2+8b+6=(2a+4)+8b+6
=2a+8b+10
=2(a+b)+4b+10
=4b+14
答
3*999+3+99*8+8+2*9+9+2
=3*(999+1)+(99+1)*8+2*(9+1)+9
=3*1000+8*100+2*10+9
=3829