估算:
82×69≈______ 695÷19≈______.
(1)82×69≈80×70=5600,
(2)695÷19≈700÷20=35.
故答案为:5600,35.
表达式Left("how are you",3)的值是
A.how
B.are
C.you
D.how are you
发动机过热会使充气效率降低。