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а+(-0,25в) • (-0,8с)= ?
(7а-3) • (-х -2а)= ?
-2(0,5х-1,4у)+2х+3,2у= ?
а+(-0,25в) • (-0,8с)= ?
(7а-3) • (-х -2а)= ?
-2(0,5х-1,4у)+2х+3,2у= ?
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Answers & Comments
(7а-3) -(-8 -2а)= 7а-3+8+2а=9а+5
-2(0,5х-1,4у)+2х+3,2у= -х+2.8у+2х+3.2у=х+6у