Найдите разницу между многочленами 1) 3а и 7+2а 2) 5b 2 степени -9 и 4b 2 степен...

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Найдите разницу между многочленами 1) 3а и 7+2а 2) 5b 2 степени -9 и 4b 2 степени - b + 5 3) 4х+2 и х+1 4) 3m 2 степени +m и 1-m+3m 2 степени 5) 2a-3b и -b-a 6) a 2 степени + a +1 и a 2 степени - a + 1

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oksik1970 ▪1) 3а - (7+2а) = 3a - 7 - 2a = a - 7

▪2)
$5 {b}^{2} - 9 - (4 {b}^{2} - b + 5) = 5 {b}^{2} - 9 - 4 {b}^{2} + b - 5 = {b}^{2} + b - 14$
▪3)
$4x + 2 - (x + 1) = 4x + 2 - x - 1 = 3x + 1$
▪4)
$3 {m}^{2} + m - (1 - m + 3 {m}^{2} ) = 3 {m}^{2} + m - 1 + m - 3 {m}^{2} = 2m - 1$
▪5)
$2a - 3b - ( - b - a) = 2a - 3b + b + a = 3a - 2b$
▪6)
${a}^{2} + a + 1 - ( {a}^{2} - a + 1) = {a}^{2} + a + 1 - {a}^{2} + a - 1 = 2a$

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