Tìm hai số tự nhiên liên tiếp biết tổng của chúng là 2019

Có bao nhiêu giá trị nguyên của tham số m thuộc đoạn [−3; 3] để hàm số f(x)  =(m + 1 x + m − 2 đồng biến trên R.

A. 7

B. 5

C. 4

D. 3

Read the text and choose the correct answer A, B, C or D for each of the gaps.

After a tour in Cu Chi, we are moving to Mot Thoang Vietnam craft village (16) ______ at Phu Binh Village, Ho Chi Minh City. Arriving at Mot Thoang Vietnam, we observe on-the-spot (17) ______craft persons weave tho cam (ethnic brocade fiber), (18) ______wooden logs into wonders and weave rattan into home appliances. Mot Thoang Vietnam can (19) ______your need to know what many of Vietnam's traditional craft villages are like. The quarter of craft villages at Mot Thoang Vietnam is quiet, but not boring (20) ______craft persons chat amidst the clacking sound of wooden cudgels hitting a chisel caused by a sculptor or a (21) ______used for weaving cloth. Sitting a little far from the sculptor and the weaver (22) ______ the craftsmen and women in their simple but unique attire making giay gio (poonah paper) and inlaid gold-leaf items, doing the (23) ______and the farming. We enjoy a traditional Vietnamese lunch at the village. After lunch, more walking to the traditional house of Vietnam from South to North with different (24) ______. Watching a traditional dance show by the (25) ______people.

Question 22:

A. is

B. was

C. were

D. are