题目:
加工900个零件,原计划每天生产a个,实际每天生产b个(b>a).
(1)b-a表示______.
(2)900÷b表示______.
(3)900÷a表示______.
(4)求“实际比计划提前几天完成”的式子是______.
(5)当a=50,b=60时,实际比计划提前______天完成.
答案:
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