化简求值题:一.5abc-{2a²b-[3abc-(4ab²-a²b)]}; (其中a=1,b=2,c=-1)二.3(a-2b)²n的次方-(2b-a)2n-1+5-5(2b-a)²n+2(a-2b)²-n-4;(其中a-2b+1=0)三.二分之一a²b-[三分之二a²b-(3abc-a
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/03 04:11:03
![化简求值题:一.5abc-{2a²b-[3abc-(4ab²-a²b)]}; (其中a=1,b=2,c=-1)二.3(a-2b)²n的次方-(2b-a)2n-1+5-5(2b-a)²n+2(a-2b)²-n-4;(其中a-2b+1=0)三.二分之一a²b-[三分之二a²b-(3abc-a](/uploads/image/z/659636-44-6.jpg?t=%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%E9%A2%98%3A%E4%B8%80.5abc-%7B2a%26%23178%3Bb-%5B3abc-%284ab%26%23178%3B-a%26%23178%3Bb%29%5D%7D%3B+%28%E5%85%B6%E4%B8%ADa%3D1%2Cb%3D2%2Cc%3D-1%EF%BC%89%E4%BA%8C.3%28a-2b%29%26%23178%3Bn%E7%9A%84%E6%AC%A1%E6%96%B9-%EF%BC%882b-a%EF%BC%892n-1%2B5-5%EF%BC%882b-a%EF%BC%89%26%23178%3Bn%2B2%EF%BC%88a-2b%EF%BC%89%26%23178%3B-n-4%3B%EF%BC%88%E5%85%B6%E4%B8%ADa-2b%2B1%3D0%EF%BC%89%E4%B8%89.%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80a%26%23178%3Bb-%5B%E4%B8%89%E5%88%86%E4%B9%8B%E4%BA%8Ca%26%23178%3Bb-%283abc-a%26%23)
化简求值题:一.5abc-{2a²b-[3abc-(4ab²-a²b)]}; (其中a=1,b=2,c=-1)二.3(a-2b)²n的次方-(2b-a)2n-1+5-5(2b-a)²n+2(a-2b)²-n-4;(其中a-2b+1=0)三.二分之一a²b-[三分之二a²b-(3abc-a
化简求值题:一.5abc-{2a²b-[3abc-(4ab²-a²b)]}; (其中a=1,b=2,c=-1)
二.3(a-2b)²n的次方-(2b-a)2n-1+5-5(2b-a)²n+2(a-2b)²-n-4;(其中a-2b+1=0)
三.二分之一a²b-[三分之二a²b-(3abc-a²c)-4a²c]-3abc 其中:|a+1|=2,|b-2|+(c-1)²=0
化简求值题:一.5abc-{2a²b-[3abc-(4ab²-a²b)]}; (其中a=1,b=2,c=-1)二.3(a-2b)²n的次方-(2b-a)2n-1+5-5(2b-a)²n+2(a-2b)²-n-4;(其中a-2b+1=0)三.二分之一a²b-[三分之二a²b-(3abc-a
1:∵5abc-[2a²b-93abc-4ab²+a²b)]
∴5abc-92a²b-3abc+4ab²-a²b)
∵5abc-2abc+3abc-4ab²+a²b
∴ab(5c-2a+3c-4b+a)
∵ab(8c-a-4b)
∴2(-8-1-8)
∴-34
nan
原式=5abc-[2a2b-3abc+(4ab2-a2b)]=5abc-2a2b+3abc-4ab2+a2b=8abc- a2b-4ab2
硬解设AC=b,BC=a,FC=x cos60=(1 b^2-x^2)/2b cos60=(4 b^2-a^2)/4b x^2=ab 解得b=1或b=0.5 (你的题目很难看)