已知a是实数，b是有理数，若（a+√2）/（b-√2）=2，则2a+b是（）.

What does Enterprise Air offer?A．Gourmet mealsB．More space for luggageC．A variety of movie choicesD．Discounts on corporate bookings

A.Gourmet
B.More
C.A
D.Discounts

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已知a,b,c都是非负整数,且2a×3b×7c=1176,则2a+3b+7c的值是( ).(A)21(B)23 (C)25 (D)28 点击查看答案