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katerinamerica
@katerinamerica
July 2022
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Упростить и найти числовое значение выражения
10b- (За + (2b - (4a – b)))
при а = 1 3/4, b = -2 4/7
12x-(4y+(3x-(5y-2x)))
при x= - 13/14, y=3,1
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user53026
1) 10b-(3a+2b-(4a-b)))=
= 10b-3a-2b+4a-b=
= 7b+a= 7*(-2 4/7)+1 3/4=
7*(-18/7)+1 3/4=
= -18+1 3/4= -16 1/4
2)12x-(4y+(3x-(5y-2x)))=
= 12x-4y-3x+5y-2x=
= 7x+y=
= 7*(-13/14) +3,1=
= -6,5+3,1=
= -3,4
2 votes
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Answers & Comments
= 10b-3a-2b+4a-b=
= 7b+a= 7*(-2 4/7)+1 3/4=
7*(-18/7)+1 3/4=
= -18+1 3/4= -16 1/4
2)12x-(4y+(3x-(5y-2x)))=
= 12x-4y-3x+5y-2x=
= 7x+y=
= 7*(-13/14) +3,1=
= -6,5+3,1=
= -3,4