bài tập toán

Question

Thực hiện các phép tính sau:

a) 5x+104x−8.4−2xx+25x+104x−8.4−2xx+2;             b) x2−362x+10.36−x

Answer 1

a) 5x+104x−8.4−2xx+25x+104x−8.4−2xx+2 

=(5x+10).(4−2x)(4x−8).(x+2)=5(x+2).2(2−x)4(x−2)(x+2)=(5x+10).(4−2x)(4x−8).(x+2)=5(x+2).2(2−x)4(x−2)(x+2)

=5(2−x)2(x−2)=−52=5(2−x)2(x−2)=−52

b) x2−362x+10.36−xx2−362x+10.36−x 

=(x2−36).3(6−x)(2x+10)=(x2−36).3(6−x)(2x+10)

=−3(6−x)(x+6)2(x+5)(6−x)=−3(x+6)2(x+5)