1\2a-(2a-2\3b^(2))+(-3\2a+1\3b^(2)),a=-1\2,b=1,要写先化简再求值.
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![1\2a-(2a-2\3b^(2))+(-3\2a+1\3b^(2)),a=-1\2,b=1,要写先化简再求值.](/uploads/image/z/15223088-56-8.jpg?t=1%5C2a-%282a-2%5C3b%5E%282%29%29%2B%EF%BC%88-3%5C2a%2B1%5C3b%5E%282%29%EF%BC%89%2Ca%3D-1%5C2%2Cb%3D1%2C%E8%A6%81%E5%86%99%E5%85%88%E5%8C%96%E7%AE%80%E5%86%8D%E6%B1%82%E5%80%BC.)
1\2a-(2a-2\3b^(2))+(-3\2a+1\3b^(2)),a=-1\2,b=1,要写先化简再求值.
1\2a-(2a-2\3b^(2))+(-3\2a+1\3b^(2)),a=-1\2,b=1,要写先化简再求值.
1\2a-(2a-2\3b^(2))+(-3\2a+1\3b^(2)),a=-1\2,b=1,要写先化简再求值.
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