1/ You won’t get paid for time off ______ you have a doctor’s note.
A. If B. unless C. or D. otherwise
2/ We'll buy everything you produce,______ of course the price is right.
A. without B. but for
C. provided D. or
3/ I won't have an operation ________ surgery is absolutely necessary.
A. If B. but for C. otherwise D. unless
log√
log√ (x2+x)-6/2x-1
x= 6/2-1
x=-6
Vậy x = -6