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Olyaxlebyshek
@Olyaxlebyshek
August 2022
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1.Упростите буквенное выражение:
а) 7х-5-4(2х-9)=
б)5(х-3)-(6х-11)=
в)х-7-3(2х-8)=
г)6(2х+3)-4(7х-20)=
2.Раскройте скобки и вычислите:
в) 136 + (6,3 + 64) =
г) (3,7 + 4,96) —(3,7 — 3,04) =
д) —7,8 — (5,39 — 12,8) =
е) (3,91 — 6,57) + (6,57 — 2,91) =
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ВикаВикторовна
Verified answer
1. а) 7х-5-4(2х-9) = 7х-5-8х+36 = -х+31
б) 5(х-3)-(6х-11) = 5х-15-6х+11 = -х-4
в) х-7-3(2х-8) = х-7-6х+24 = -5х+17
г) 6(2х+3)-4(7х-20) = 12х+18-28х+80 = -16х+98
2. в) 136+(6,3+64) = 136+6,3+64 = 206,3
г) (3,7+4,96)-(3,7-3,04) = 3,7+4,96-3,7+3,04 = 8
д) -7,8-(5,39-12,8) = -7,8-5,39+12,8 = -0,39
е) (3,91-6,57)+(6,57-2,91) = 3,91-6,57+6,57-2,91 = 1
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Answers & Comments
Verified answer
1. а) 7х-5-4(2х-9) = 7х-5-8х+36 = -х+31б) 5(х-3)-(6х-11) = 5х-15-6х+11 = -х-4
в) х-7-3(2х-8) = х-7-6х+24 = -5х+17
г) 6(2х+3)-4(7х-20) = 12х+18-28х+80 = -16х+98
2. в) 136+(6,3+64) = 136+6,3+64 = 206,3
г) (3,7+4,96)-(3,7-3,04) = 3,7+4,96-3,7+3,04 = 8
д) -7,8-(5,39-12,8) = -7,8-5,39+12,8 = -0,39
е) (3,91-6,57)+(6,57-2,91) = 3,91-6,57+6,57-2,91 = 1