Ta có:x5-15x4+16x3-29x3+13x=x5-15x4-13x3+13x
Thay x=4 vào bt, ta có:
45-15.44-13.43+13.4
=1024-3840-832+52
=-3596
a= 45 - 15.44+16.43-29.42+13.4
a= 1024 -15.256 + 16.64-29.16+52
a=1024 - 3840+1024-464 +52
a=(1024-1024) + (3840-464+52)
a=0+ 3428
a=3428