1)3(x-7)+5x; 2)5(4-3x)+8x; 3)(y-4)*2+10y; 4)(2y+5)*4-11y; - вопрос №34244711375254383421042541154205366 от whitezizickela 25.01.2020 13:26

Question

Математика: 1)3(x-7)+5x; 2)5(4-3x)+8x; 3)(y-4)*2+10y; 4)(2y+5)*4-11y; 5)4x+2(0,5x+3); 6)6x-3(x-7).

whitezizickela · Answer

3(x-7)+5x = 3x-21+5x=8x-215(4-3x)+8x = 20-15x+8x=20-7x(y-4)*2+10y = 2y-8+10y=12y-8(2y+5)*4-11y = 8y+20-11y=-3y+20=20-3y4x+2(0,5x+3) = 4x+x+6=5x+66x-3(x-7) = 6x-3x+21=3x+21=3(x+7) ...