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bel72777

Ответ:

Пошаговое объяснение:

1.

a) n+0,65

б) 20·(n+0,65)=20n+13

2.

а) A+B=3x-4y+5x+2y=8x-2y=2(4x-y)

б) A-B=3x-4y-5x-2y=-2x-6y=-2(x+3y)

3.

а) 7(x-2y)-2(2x+y)-3x=7x-14y-4x-2y-3x=-16y

б) -16·0,5=-16·1/2=-8

4.

4 1/2 ·(2x-4)-8,1(2/9 +1 1/9 ·x)=-19,8

9/2 ·(2x-4) -81/10 ·(2/9 +10/9 ·x)=-19,8

9x-9·2 -9/5 -9x=-19,8

-18-1,8=-19,8

-19,8=-19,8

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