「1」(1/3p-5mn)^2 「2」(2a+3b-1)(1-2a-3b) 「3」(x-y+z)^2 「4」(3x^2+1/2y-2/3y^2)(-1/2xy)^3
发布网友
发布时间:2022-05-17 13:25
我来回答
共1个回答
热心网友
时间:2023-10-23 00:01
(1/2a+1/3b)(1/3b-1/2a)-(1/3b-1/2a)^2+(-1/3b-1/2a)^2
=(1/3b+1/2a)(1/3b-1/2a)+(1/3b+1/2a)^2 -(1/3b-1/2a)^2
=(1/3b+1/2a)(1/3b-1/2a)+(1/3b+1/2a +1/3b-1/2a)(1/3b+1/2a -1/3b+1/2a)
=(1/3b)²-(1/2a)²+(2/3ab)
化简完毕 将a=1/2 b=-1/3 代入得
=[1/3(-1/3)]²-[1/2(1/2)]+2/3(1/2)(-1/3)
=1-1+4
=4