Giải câu 2 trang 51 toán VNEN 8 tập 1.
a) 5x+104x−8.4–2xx+2 = 5(x+2)4(x–2).(−2)(x–2)x+2 = 5(x+2)(−2)(x–2)4(x–2)(x+2) = −52;
b) x2–362x+10.36–x = (x–6)(x+6)2(x+5).(−3)x–6 = (x–6)(x+6)(−3)2(x+5)(x–6) = −3(x+6)2(x+5).
