(2x+5y)^2 (1/3m-1/2)^2 (-2t-1)^2 (1/5x+1/10y)^2 (7ab+2)^2 (-cd+1/2)^2
问题描述:
(2x+5y)^2 (1/3m-1/2)^2 (-2t-1)^2 (1/5x+1/10y)^2 (7ab+2)^2 (-cd+1/2)^2
答
(2x+5y)^2 =4x^2+20xy+25y^2
(1/3m-1/2)^2=1/9m^2-1/3m+1/4
(-2t-1)^2=4t^2+4t+1
(1/5x+1/10y)^2=1/25x^2+1/25xy+1/100y^2
(7ab+2)^2 =49a^2b^2+28ab+4
(-cd+1/2)^2=c^2d^2-cd+1/4
这就是过程,根据完全平方公式得到的