Вправи: 204

204. Спростіть вираз:

1) (2x\1+3y1-3y + 2x\1-3y3y+1) • 9y2+ 1-6y4x = 2x+6xy+2x-6xy1-3y(1+3y) • 9y2- 6y+14x = 4x • (9y2- 6y+1)1-3y1+3y•4x = (3y-1)21-3y(1+3y) = (1-3y)21-3y(1+3y) = 1-3y1+3y;

2) (y2- x2m2- n2 • m+nx-y – xn-m) • m-n2y = ((y2- x2) •(m+n)(m2- m2)(x-y) + xm-n) • m-n2y = (y-x•y+x•(m+n)m-n•m+n(x-y) + xm-n) • m-n2y = (–x-y(x+y)m-n(x-y) + xm-n) • m-n2y = -x-y+xm-n • m-n2y = –ym-n • m-n2y = –y •(m-n)m-n•2y = –0,5.