Question

求-1/2a-2(a-1/2b的平方)-(3/2a-1/3b的平方)的值，已知a=-1，b=2/3

Answer 1

解：
-1/2a-2(a-1/2b的平方)-(3/虚世2a-1/3b的平方)
=-1/2a-2a+b的平方-3/2a+1/3b的平方
=-1/2a-2a-3/2a+b的平方腔好+1/3b的平差圆肢方
=-4a+4b²/3 其中a=-1，b=2/3
=-4×（-1）+4×（2/3）²/3
=4+16/27
=4又16/17

Answer 2

-1/2a-2(a-1/2b的平方)-(3/2a-1/含孙3b的平方)
=-1/2a-2a+b²-3/谈汪链2a+1/3b²
=-4a+4/3b² a=-1，b=2/3
=-4*(-1)+4/3*(2/3)²陵唤
=4+32/27
=5又27分之5