Jawabanmu

2014-08-26T21:24:04+07:00
10x(2y-10)= 20xy-100x
(x+5)(5x-1)= 5x²-x+25x-5= 5x²+24x-5
(7-2x)(2x-7) = 14x-49-4x²+14x= -4x²+28x-49
3 3 3
2014-08-26T23:43:29+07:00
10x(2y-10) = 20xy -100

(x+5)(5x-1) = 5x'2-x+25x-5
= 5x'2+24x-5

(7-2x)(2x-7) = 14x-49-4x'2+14x
= -4x'2+28x-49
Semoga berguna
2 5 2