Bai 1: Thuc hien phep tinh : a)(135-32)-(18+135) b)3.(-2)2+5.(-4)-27.(-2)0 c)-32.14-(-68).(-14) d)35(17-25)-25(17-35) e)(44/7-35/9)-(52/7+4/9) f)(3/8+-3/4+7/12):5/6+1/2 g)0,7.2 2/3.20.0,375.5/28 h)3/5.7+3/7.9+..+3/59.61 Bai2 Tim x a)3x075=45+3.(-25) b)|2x-6|=16 c)(x+1)3=-27 d)(x2-4).(6-2x)=0 e)3/8-1/6x=1/4 f)-2/5x+11/3 =7/3 g)9/x=x/4 h)-4/7=x-40/31-5x Bai3 Lop6a co 42h/s gom 3loai:gio,kha,trung binh . So h/s gioi chiem 1/6so hoc sinh ca lop , so h/s trung binh bang 3/7 so h/s con lai. a) Tinh so h/s moi loai b) Tinh ti so % cuaso h/s gioi voi so h/s kha cua lop ? Bai4 Hai so co tong la 116 . Tim 2 so biet 5/7 so nay bang 2/3 so kia LUU Y So 35/9 va so 11/3 la hon so nha
MONG CAC BAN LAM HO MK MINH DANG CAN GAP . THANHS