Решите неравенство 1) (x-5)(x+5)-x(x+3)6y-20 3) (x+2)(x-6)-(x-7)(x+7)<30-3x 4) x(8-3x)+11<3(7-x)(x+7)+8 Помощь Людии
3)(x+2)(x-6)-(x-7)(x+7)<30x-3x<br>x²-6x+2x-12-x²+7x-7x-49<27x<br>-4x-61<27x<br>61<31x<br>x<31/61<br>4)x(8-3x)+11<3(7-x)(x+7)+8<br>8x-3x²+11<21-3x(x+7)+8<br>11-21+8<3x²-8x-3x(x+7)<br>-2<3x²-8x-3x²-7x<br>-2<-15x<br>x<2/15