1\2a-(2a-2\3b^(2))+(-3\2a+1\3b^(2)),a=-1\2,b=1,要写先化简再求值.
问题描述:
1\2a-(2a-2\3b^(2))+(-3\2a+1\3b^(2)),a=-1\2,b=1,要写先化简再求值.
答
1\2a-(2a-2\3b^(2))+(-3\2a+1\3b^(2)
=1/2a-2a-3/2a+2/3b²+1/3b²
=a+b²
=-1/2+1
=3/2