4) Разложите многочлены на множители:
a) 3a(x – y) + 5b(x – y) = a) 7m(c + d) – 6n(c + d) =
b) 7m – 7n +md – nd = b) 8x – 8y + cx – cy =
5) Найдите AB, MN. Составьте разность ABиMNи найдите его значение, если:
a = 3 c = 2
A = 5a – 1, B = 2a – 3 A =6c – 7, B = 4c – 3
M = 4a, N = 2a M =11c, N = 2c.
a) 3a(x – y) + 5b(x – y) = a) 7m(c + d) – 6n(c + d) =
b) 7m – 7n +md – nd = b) 8x – 8y + cx – cy =
5) Найдите AB, MN. Составьте разность ABиMNи найдите его значение, если:
a = 3 c = 2
A = 5a – 1, B = 2a – 3 A =6c – 7, B = 4c – 3
M = 4a, N = 2a M =11c, N = 2c.
Answers & Comments
Ответ:
3a(x – y) + 5b(x – y) = (3a+5b)(x-y)
a) 7m(c + d) – 6n(c + d) =(7m-6n)(c + d)
b) 7m – 7n +md – nd = 7(m – n)+d(m – n)=(m – n)(7+d)
b) 8x – 8y + cx – cy =8(x-y)+c(x-y)=(x-y)(8+c)
a = 3 c = 2
1)A = 15 – 1=14, B = 6 – 3=3
M = 12, N = 6
AB= 14+3=17, MN=12+6=18
AB-MN=17-18=-1
2)A =12 – 7=5, B = 8– 3=5
M =22, N = 4.
AB=5+5=10, MN=22+4=26
AB-MN=10-26=-14