(3x-2y)^2= (5x+4y)^2= (7a-3b)^2= (2a+8b)^2=
Решите задачу:
1)(3х-2у)^2=9x^2-12xy+4y^2 2)(5х+4у)^2=25x^2+40xy+16y^2 3)(7а-3b)^2=49a^2-42ab+9b^2 4)(2a+8b)^2=4a^2+32ab+64b^2