Объяснение:
a) (a-4)(a-2)=a²-2a-4a+8=a²-6a+8
b) (3x+1)(5x-6)=15x²-18x+5x-6=15x²-13x-6
a) 2x(x-1)-3(x-1)=(x-1)(2x-3)
b) ab+ac+4b+4c=a(b+c)+4(b+c)=(b+c)(a+4)
7:2 1/3 +4:1 1/3= 7:(7/3) +4:(4/3)= 7*3/7 + 4*3/4= 3+3=6
Объяснение:
a) (a-4)(a-2)=a²-2a-4a+8=a²-6a+8
b) (3x+1)(5x-6)=15x²-18x+5x-6=15x²-13x-6
a) 2x(x-1)-3(x-1)=(x-1)(2x-3)
b) ab+ac+4b+4c=a(b+c)+4(b+c)=(b+c)(a+4)
7:2 1/3 +4:1 1/3= 7:(7/3) +4:(4/3)= 7*3/7 + 4*3/4= 3+3=6