Пошаговое объяснение:
a) 2·(2 3/4 ·a+3 1/2)+2 1/2 ·a=2·(11/4 ·a +7/2) +5/2 ·a=11/2 ·a+7 +5/2 ·a=8a+7=8·13/5 +7=104/5 +7=27,8
б) 3·(4 4/9 ·x+3 1/3)-9 1/3 ·x=3·(40/9 ·x +10/3) -28/3 ·x=40/3 ·x+10 -28/3 ·x=4x+10=4·7/4 +10=17
в) 2 3/8 ·x-(1 1/4 ·x+3 7/12)·3=19/8 ·x-(5/4 ·x +43/12)·3=19/8 ·x -30/8 ·x +43/4=-11/8 ·x +43/4=-11/8 ·16/7 +43/4=-22/7 +10 3/4=-3 4/28 +10 21/28=7 17/28
г) 4x -1/4 ·(5x -1/4 ·(4x -1/5))=4x -1/4 ·(5x-x +1/20)=4x-x +1/80=3x +1/80=3·4/15 +1/80=64/80 +1/80=13/16=0,8125
Пошаговое объяснение:
a) 2·(2 3/4 ·a+3 1/2)+2 1/2 ·a=2·(11/4 ·a +7/2) +5/2 ·a=11/2 ·a+7 +5/2 ·a=8a+7=8·13/5 +7=104/5 +7=27,8
б) 3·(4 4/9 ·x+3 1/3)-9 1/3 ·x=3·(40/9 ·x +10/3) -28/3 ·x=40/3 ·x+10 -28/3 ·x=4x+10=4·7/4 +10=17
в) 2 3/8 ·x-(1 1/4 ·x+3 7/12)·3=19/8 ·x-(5/4 ·x +43/12)·3=19/8 ·x -30/8 ·x +43/4=-11/8 ·x +43/4=-11/8 ·16/7 +43/4=-22/7 +10 3/4=-3 4/28 +10 21/28=7 17/28
г) 4x -1/4 ·(5x -1/4 ·(4x -1/5))=4x -1/4 ·(5x-x +1/20)=4x-x +1/80=3x +1/80=3·4/15 +1/80=64/80 +1/80=13/16=0,8125