Giải toán giúp em với ạ , 20 điểm 5 sao

Giúp mình giải bài này với ạ 🥺

Giúp mình với mng ơi cảm ơn gấc nhìuuuuu

Choose the correct answer 1.When you rang, I .............. my bike. A.cleand B.was cleaning C.used to clean D.clean 2.At my last basketball club, we............... A.were training B.training C.train D.used to train 3.I really .......... the meal we had at your huose last Tuesday. A.was liking B.liked C.like D.am liking 4.We ............. to the beach every day when we were on holiday. A.went B.were going C.go D. used to going 5.I broke my leg when Tony and I ............. for the school sports day. A.practised B.used to practise C.were practising D.are practising 6.Leon never .......... about it, but he was once a world champion skier. A.talks B.is talking C.was talking D.talk 7.I ......... like golf, but now I really like it. A.don't use to B.don't used to C.didn't used to D.didn't use to 8.Denise .......... at the stadium until she finds a better job. A.works B.is working C.used to work D.was working

Tính C = $\frac{1}{1.4.7.10}$ + $\frac{1}{4.7.10.13}$ + .... + $\frac{1}{151.154.157.160}$ Giúp nha các bạn.

giúp e vs mn ơi!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Hình hộp chữ nhật với kích thước 5*5*3 có bao nhiêu trục đối xứng? A.3. B.5. C.6. D.9

Mn giúp e vs . Em cảm ơn trước ạ

Cho a+b+c=0 CMR: ($a^{2}$+ $b^{2}$ +$c^{2}$)^2=2( ($a^{4}$+ $b^{4}$ +$c^{4}$)

giúp mình hai bài này với ạ. ai nhanh nhất mình vote 5* + ctlhn cho.( làm trc 5h hôm nay ạ. đang cần gấp)