раскройте скобки и упростите выражения. (полное решение)
1. а) 2x-(2x+y)+y б) -a+(2a-b)+2b в) 7-(b+14)-2b г) 3b-(18+b)+8
2. а) 2(3-x)-(8+x) б) -4(y+5)+(12-y) в) -(7-x)+4(x-5) г)-9(y-4)-(12+y)
1) а) 2x-(2x+y)+y = 2x-2x-y+y = 0
б) -a+(2a-b)+2b = -a+2a-b+2b = а+b
в) 7-(b+14)-2b = 7-b-14-2b = -7-3b
г) 3b-(18+b)+8 = 3b-18-b+8 = 2 -10
2) а) 2(3-x)-(8+x) = 6-2x-8-x = -2-3x
б) -4(y+5)+(12-y) = -4y-20+12-y = -5y -8
в) -(7-x)+4(x-5) = -7+x+4x-20 = 5x-27
г) -9(y-4)-(12+y) = -9y+36-12-y = 24 - 20y
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Answers & Comments
1) а) 2x-(2x+y)+y = 2x-2x-y+y = 0
б) -a+(2a-b)+2b = -a+2a-b+2b = а+b
в) 7-(b+14)-2b = 7-b-14-2b = -7-3b
г) 3b-(18+b)+8 = 3b-18-b+8 = 2 -10
2) а) 2(3-x)-(8+x) = 6-2x-8-x = -2-3x
б) -4(y+5)+(12-y) = -4y-20+12-y = -5y -8
в) -(7-x)+4(x-5) = -7+x+4x-20 = 5x-27
г) -9(y-4)-(12+y) = -9y+36-12-y = 24 - 20y