3y²-x²+(2x-y)-(x²+3y²),其中:x=负3,y=2 先化简,在求值(ab-3a²)-2b²-5ab-(a²-2ab)其中:a=1 y=负2
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![3y²-x²+(2x-y)-(x²+3y²),其中:x=负3,y=2 先化简,在求值(ab-3a²)-2b²-5ab-(a²-2ab)其中:a=1 y=负2](/uploads/image/z/1344932-44-2.jpg?t=3y%26%23178%3B-x%26%23178%3B%2B%EF%BC%882x-y%EF%BC%89-%EF%BC%88x%26%23178%3B%2B3y%26%23178%3B%EF%BC%89%2C%E5%85%B6%E4%B8%AD%EF%BC%9Ax%3D%E8%B4%9F3%2Cy%3D2+%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%9C%A8%E6%B1%82%E5%80%BC%EF%BC%88ab-3a%26%23178%3B%EF%BC%89-2b%26%23178%3B-5ab-%EF%BC%88a%26%23178%3B-2ab%EF%BC%89%E5%85%B6%E4%B8%AD%EF%BC%9Aa%3D1+y%3D%E8%B4%9F2)
3y²-x²+(2x-y)-(x²+3y²),其中:x=负3,y=2 先化简,在求值(ab-3a²)-2b²-5ab-(a²-2ab)其中:a=1 y=负2
3y²-x²+(2x-y)-(x²+3y²),其中:x=负3,y=2 先化简,在求值
(ab-3a²)-2b²-5ab-(a²-2ab)其中:a=1 y=负2
3y²-x²+(2x-y)-(x²+3y²),其中:x=负3,y=2 先化简,在求值(ab-3a²)-2b²-5ab-(a²-2ab)其中:a=1 y=负2
=3y²-x²-x²-3y²+2x-y=-2x²+2x-y=-18-6-2=-26
=ab-3a²-2b²-5ab-a²+2ab=-4a²-2b²-2ab=-4-8+4=-8