— How far can you run without stopping?— _________. I've never tried.
A:Don't mention it
B:That's all right
C:I have no idea
D:Go ahead
填上适当的数.
① 2×4-____=0
② ____+3×2=10
③ 2×2+____=7
④ 4×3+____=15
某农场第一车间有x人,第二车间比第一车间人数的 45 少30人,那么: