初一几道计算忘了.x²-5x=2a(x-2y)-3b(2y-x)-4c(x-2y)=-5x²y²+10xy³-15x²y=21×3.14+62×3014+17×3.14=(P-4)(P+1)+3P=
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![初一几道计算忘了.x²-5x=2a(x-2y)-3b(2y-x)-4c(x-2y)=-5x²y²+10xy³-15x²y=21×3.14+62×3014+17×3.14=(P-4)(P+1)+3P=](/uploads/image/z/12621822-6-2.jpg?t=%E5%88%9D%E4%B8%80%E5%87%A0%E9%81%93%E8%AE%A1%E7%AE%97%E5%BF%98%E4%BA%86.x%26%23178%3B-5x%3D2a%EF%BC%88x-2y%EF%BC%89-3b%282y-x%29-4c%28x-2y%29%3D-5x%26%23178%3By%26%23178%3B%2B10xy%26%23179%3B-15x%26%23178%3By%3D21%C3%973.14%2B62%C3%973014%2B17%C3%973.14%3D%EF%BC%88P-4%EF%BC%89%EF%BC%88P%2B1%EF%BC%89%2B3P%3D)
初一几道计算忘了.x²-5x=2a(x-2y)-3b(2y-x)-4c(x-2y)=-5x²y²+10xy³-15x²y=21×3.14+62×3014+17×3.14=(P-4)(P+1)+3P=
初一几道计算
忘了.
x²-5x=
2a(x-2y)-3b(2y-x)-4c(x-2y)=
-5x²y²+10xy³-15x²y=
21×3.14+62×3014+17×3.14=
(P-4)(P+1)+3P=
初一几道计算忘了.x²-5x=2a(x-2y)-3b(2y-x)-4c(x-2y)=-5x²y²+10xy³-15x²y=21×3.14+62×3014+17×3.14=(P-4)(P+1)+3P=
x²-5x=x(x-5)=> x=0 x=5
2a(x-2y)-3b(2y-x)-4c(x-2y)= (2a+3b-4c)(x-2y) => x=2y
-5x²y²+10xy³-15x²y=xy(-5xy+10y²-15x) => x=y=0 ,x=1 y=-1
21×3.14+62×3014+17×3.14=3.14(21+17+6200)=19590.46
(P-4)(P+1)+3P=p²-3p-4+3p=p²-4 => p=2 p=-2
x(x-5)
(x-2y)(2a+3b-4c)
-5xy(xy-2y+3x)
314
(p+2)(p-2)
过程就没有了打起来太累了 我也是初一的诶