数学因式分解跟计算题x2-4(x-1) x4-y4 (5a2次方+2a)—4(2+2a次方) 4(x-y)3次方乘{-2分之一(y-x)3次方}2次方先化简,再求值{(x+2y)(x-2y)—(x+4y)2次方}除以4y
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![数学因式分解跟计算题x2-4(x-1) x4-y4 (5a2次方+2a)—4(2+2a次方) 4(x-y)3次方乘{-2分之一(y-x)3次方}2次方先化简,再求值{(x+2y)(x-2y)—(x+4y)2次方}除以4y](/uploads/image/z/225753-33-3.jpg?t=%E6%95%B0%E5%AD%A6%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E8%B7%9F%E8%AE%A1%E7%AE%97%E9%A2%98x2-4%EF%BC%88x-1%EF%BC%89++++++++++++x4-y4+++++++%EF%BC%885a2%E6%AC%A1%E6%96%B9%2B2a%EF%BC%89%E2%80%944%EF%BC%882%2B2a%E6%AC%A1%E6%96%B9%EF%BC%89++++++++++++4%EF%BC%88x-y%EF%BC%893%E6%AC%A1%E6%96%B9%E4%B9%98%EF%BD%9B-2%E5%88%86%E4%B9%8B%E4%B8%80%EF%BC%88y-x%EF%BC%893%E6%AC%A1%E6%96%B9%EF%BD%9D2%E6%AC%A1%E6%96%B9%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BD%9B%EF%BC%88x%2B2y%EF%BC%89%EF%BC%88x-2y%EF%BC%89%E2%80%94%EF%BC%88x%2B4y%EF%BC%892%E6%AC%A1%E6%96%B9%EF%BD%9D%E9%99%A4%E4%BB%A54y)
数学因式分解跟计算题x2-4(x-1) x4-y4 (5a2次方+2a)—4(2+2a次方) 4(x-y)3次方乘{-2分之一(y-x)3次方}2次方先化简,再求值{(x+2y)(x-2y)—(x+4y)2次方}除以4y
数学因式分解跟计算题
x2-4(x-1) x4-y4
(5a2次方+2a)—4(2+2a次方) 4(x-y)3次方乘{-2分之一(y-x)3次方}2次方
先化简,再求值
{(x+2y)(x-2y)—(x+4y)2次方}除以4y,其中x=5,y=2.
数学因式分解跟计算题x2-4(x-1) x4-y4 (5a2次方+2a)—4(2+2a次方) 4(x-y)3次方乘{-2分之一(y-x)3次方}2次方先化简,再求值{(x+2y)(x-2y)—(x+4y)2次方}除以4y
x^2-4(x-1)
=x^2-4x+4
=(x-2)^2
x^4-y^4
=(x^2+y^2)(x^2-y^2)
=(x^2+y^2)(x+y)(x-y)
(5a^2+2a)-4(2+2a^2)
=5a^2+2a-8-8a^2
=-3a^2+2a-8
4(x-y)^3·[-1/2(y-x)^3]^2
=4(x-y)^3·1/4(x-y)^6
=(x-y)^9
[(x+2y)(x-2y)-(x+4y)^2]/4y
=(x^2-4y^2-x^2-8xy+16y^2)/4y
=(12y^2-8xy)/4y
=3y-2x
=3×2-2×5
=6-10
=-4
x2-4(x-1)中的x2是什么意思?x的指数还是系数?还有x4-y4
拍张照片来好不。。。这样看不懂啊