9x+6x²-3(x-2/3x²),其中x=-2 1/4(-4x²+2x-8)-(1/2x-1),其中x=1/2,先化简再求值.(5a²-3b²)+(a²+b²)-(5a²+3b²),其中a=-1,b=1;2(a²b+ab²)-2(a²b-1)-2ab
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![9x+6x²-3(x-2/3x²),其中x=-2 1/4(-4x²+2x-8)-(1/2x-1),其中x=1/2,先化简再求值.(5a²-3b²)+(a²+b²)-(5a²+3b²),其中a=-1,b=1;2(a²b+ab²)-2(a²b-1)-2ab](/uploads/image/z/1612373-5-3.jpg?t=9x%2B6x%26%23178%3B-3%EF%BC%88x-2%2F3x%26%23178%3B%EF%BC%89%2C%E5%85%B6%E4%B8%ADx%3D-2+1%2F4%EF%BC%88-4x%26%23178%3B%2B2x-8%EF%BC%89-%EF%BC%881%2F2x-1%EF%BC%89%2C%E5%85%B6%E4%B8%ADx%3D1%2F2%2C%E5%85%88%E5%8C%96%E7%AE%80%E5%86%8D%E6%B1%82%E5%80%BC.%EF%BC%885a%26%23178%3B-3b%26%23178%3B%EF%BC%89%2B%EF%BC%88a%26%23178%3B%2Bb%26%23178%3B%EF%BC%89-%EF%BC%885a%26%23178%3B%2B3b%26%23178%3B%EF%BC%89%EF%BC%8C%E5%85%B6%E4%B8%ADa%3D-1%EF%BC%8Cb%3D1%EF%BC%9B2%EF%BC%88a%26%23178%3Bb%2Bab%26%23178%3B%EF%BC%89-2%EF%BC%88a%26%23178%3Bb-1%EF%BC%89-2ab%26%23)
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9x+6x²-3(x-2/3x²),其中x=-2 1/4(-4x²+2x-8)-(1/2x-1),其中x=1/2,先化简再求值.(5a²-3b²)+(a²+b²)-(5a²+3b²),其中a=-1,b=1;2(a²b+ab²)-2(a²b-1)-2ab
9x+6x²-3(x-2/3x²),其中x=-2 1/4(-4x²+2x-8)-(1/2x-1),其中x=1/2,先化简再求值.
(5a²-3b²)+(a²+b²)-(5a²+3b²),其中a=-1,b=1;
2(a²b+ab²)-2(a²b-1)-2ab²-2,其中a=-2,b=2
9x+6x²-3(x-2/3x²),其中x=-2 1/4(-4x²+2x-8)-(1/2x-1),其中x=1/2,先化简再求值.(5a²-3b²)+(a²+b²)-(5a²+3b²),其中a=-1,b=1;2(a²b+ab²)-2(a²b-1)-2ab
x到底等于
-2 1/4(-4x²+2x-8)-(1/2x-1)
还是等于
1/2
[补充一下:9x+6x²-3(x-2/3x²)化简得:6x+8x²]
这题直接代入就行了。没有什么技巧和方法。
硬算是一种技能,且算且珍惜!