75除以9,商几,余几?
75÷9=8…3.
答:商是8,余数是3.
Ever since my brother graduated from the university, he _______ in the present company for 15 years and he is now chief engineer of the company. [ ]
A. worked
B. has been working
C. is working
D. works
(10分)一质量为m ="40" kg的小孩站在电梯内的体重计上.电梯从t =0时刻由静止开始上升,在0到6 s内体重计示数F的变化如图所示.试问:在这段时间内电梯上升的高度是多少?取重力加速度g="10" m/s2.