先化简,在求值(3x²-4)-(2x²-5x+6)+(x²-5x),其中x=-二分之三化简:-9y+6x²+3(y-三分之二x²)3x²-[7x-(4x-3)-2x]5a²-[a²+(5a²-2a)-2(a²-3a)]真的不会了,今天下午就要
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![先化简,在求值(3x²-4)-(2x²-5x+6)+(x²-5x),其中x=-二分之三化简:-9y+6x²+3(y-三分之二x²)3x²-[7x-(4x-3)-2x]5a²-[a²+(5a²-2a)-2(a²-3a)]真的不会了,今天下午就要](/uploads/image/z/224454-30-4.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%9C%A8%E6%B1%82%E5%80%BC%283x%26%23178%3B-4%29-%282x%26%23178%3B-5x%2B6%29%2B%28x%26%23178%3B-5x%29%2C%E5%85%B6%E4%B8%ADx%3D-%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%89%E5%8C%96%E7%AE%80%EF%BC%9A-9y%2B6x%26%23178%3B%2B3%EF%BC%88y-%E4%B8%89%E5%88%86%E4%B9%8B%E4%BA%8Cx%26%23178%3B%EF%BC%893x%26%23178%3B-%5B7x-%284x-3%29-2x%5D5a%26%23178%3B-%5Ba%26%23178%3B%2B%EF%BC%885a%26%23178%3B-2a%EF%BC%89-2%EF%BC%88a%26%23178%3B-3a%EF%BC%89%5D%E7%9C%9F%E7%9A%84%E4%B8%8D%E4%BC%9A%E4%BA%86%2C%E4%BB%8A%E5%A4%A9%E4%B8%8B%E5%8D%88%E5%B0%B1%E8%A6%81)
先化简,在求值(3x²-4)-(2x²-5x+6)+(x²-5x),其中x=-二分之三化简:-9y+6x²+3(y-三分之二x²)3x²-[7x-(4x-3)-2x]5a²-[a²+(5a²-2a)-2(a²-3a)]真的不会了,今天下午就要
先化简,在求值
(3x²-4)-(2x²-5x+6)+(x²-5x),其中x=-二分之三
化简:
-9y+6x²+3(y-三分之二x²)
3x²-[7x-(4x-3)-2x]
5a²-[a²+(5a²-2a)-2(a²-3a)]
真的不会了,今天下午就要
先化简,在求值(3x²-4)-(2x²-5x+6)+(x²-5x),其中x=-二分之三化简:-9y+6x²+3(y-三分之二x²)3x²-[7x-(4x-3)-2x]5a²-[a²+(5a²-2a)-2(a²-3a)]真的不会了,今天下午就要
先化简,在求值
(3x²-4)-(2x²-5x+6)+(x²-5x),其中x=-二分之三
=3x²-4-2x²+5x-6+x²-5x
=2x²-10;
=2×9/4-10
=9/2-10
=-11/2;
-9y+6x²+3(y-三分之二x²)
=-9y+6x²+3y-2x²
=(-2)(3y-2x²)
3x²-[7x-(4x-3)-2x]
=3x²-7x+4x-3+2x
=3x²-x-3;
5a²-[a²+(5a²-2a)-2(a²-3a)]
=5a²-(a²+5a²-2a-2a²+6a)
=5a²-4a²-4a
=a²-4a
=a(a-4);
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