Question

Раскройте скобки 1.(1-x)^2 2.(m+n)^2 3.(c-d(c+d) 4.(3-y)(3+y)

Answer 1

1. $(1-x)^{2}= 1^{2} -2*1x+ x^{2}$
2.$(m+n)^{2} = m^{2} +2mn+ n^{2}$
3.(c-d)(c+d)=$a^{2} - b^{2}$
4.(3-y)(3+y)=$3^{2} - y^{2} =9 - y^{2}$