小青买了2棵黄瓜,付出1.2元,找回0.08元,每棵黄瓜的价钱是多少元?
(1.2-0.08)÷2
=1.12÷2,
=0.56(元).
答:每棵黄瓜0.56元.
I don't go out a rainy day.[ ]
A. in
B. at
C. on
D. for
设有点A(1,2,3)和B(2,-1,4),则线段AB的垂直平分面的方程为()。
A.2x+4y-z+1=0
B.2x+2y-3z-7=0
C.2x-6y+2z-7=0
D.2x+6y-2z+7=0