day la de cua truong trung hoc co so minh dao lop 6 ki 2 nhu sau
bai 1: thuc hien phep tinh
a, 2/5:(-6/5)
b, 3,4.0,7+3,4.0,3-0,4
c,, 7/15 . (-3/5) +7/15 .(-2/5)
bai 2 :
a, x:2/3 =15/8
B, 2(3-X) -5 =17
C, X/1.4 +X/4.7 +X/7.10 +X/10.13 +X/13.16
BAI 3. LOP 6B CO 32 HOC SINH. TRONG DOT XO KET HOC KI 1 NAM HOC 2015-2016, DIEM TRUG BINH MON TOAN CUA TUNG HOC SINH LOP CO 3 LOAI : GIOI, KHA, VA TRUNG BINH, TRONG DO, 1/4 SO HOC SINH DAT LOAI GIOI, 7/16 SO HOC SINH DAT LOAI KHA, SO HOC SINH CON LAI DAT LOAI TRUNG BINH. TIM SO HOC SINH DAT MOI LOAI
BAI 4: TREN CUNG MOT NUA MAT PHANG BO CHUA TIA OX, VE HAI TIA OY, OZ SAO CHO GOC XOZ =45, XOY =90 .
A, TIA OZ CO NAM GIUA HAI TIA OX VA OY KHONG ? VI SAO ?
B, SO SANH HAI GOC XOZ VA XOY
C, TIA OZ CO LA TIA PHAN GIAC CUA GOC XOY KHONG ? VI SAO ?
BAI 5: HOI KHOE PHU DONG TINH BAC NINH LAN THU IX VUA QUA CO TO CHUC THI DAU MON BONG DA, TRONG MOT BANG DAU LOAI BONG DA CO BON THI DAU VONG TRON MOT LUOT: DOI T̀HANG DUOC 3 DIEM, DOI HOA DUOC 1 DIEM, DOI THUA DUOC 0 DIEM. TONG SO DIEM CUA BON DOI KHI KET THUC VONG DAU BANG LA 16 DIEM. TINH SO TRAN HOA
bai2
a),x:2/3=15/8
x=15/8:2/3
X=15/8.3/2
X=45/16
b),2(3-X)-5=17
2(3-X)=17-5
3-X=12:2
-X=6-3
-X=3
x=-3
c)X/1.4+X/4.7+X/7.10+X/10.13+X/13.16=5/2
X(1/1.4+1/4.7+1/7.10+1/10.13+1/13.16)=5/2
X/3(3/1.4+3/4.7+3/7.10+3/10.13+3/13.16)=5/2
X/3[(1-1/4)+(1/4-1/7)+(1/7-1/10)+(1/10-1/13)+(1/13-1/16)=5/2
X/3(1-1/16)=5/2
X/3.15/16=5/2
X/3=5/2:15/16
X/3=8/3
vậy:X=8 nha
