化简再求值:(1+4Y)^2+(1-4Y)(1+4Y),其中Y=2/5
问题描述:
化简再求值:(1+4Y)^2+(1-4Y)(1+4Y),其中Y=2/5
答
(1+4Y)^2+(1-4Y)(1+4Y),
=16y^2+8y+1+1-16y^2
=8y+2
=8x0.4+2
=3.2+2
=5.2