Nếu x = 0 thì y =10
Nếu x= 1 thì y =9
Nếu x =2 thì y = 8
Nếu x = 3 thì y = 7
Nếu x = 4 thì y = 6
Nếu x = 5 thì y = 5
Nếu x =6 thì y = 4
Nếu x = 7 thì y = 3
Nếu x = 8 thì y = 2
Nếu x = 9 thì y = 1
Nếu x = 0 thì y = 10
giai giup minh minh bai lam su phu
/ x - 2 / + 4x = 17
/ x + 1 / - 2x = -10
2xy - x + 4y = 11
lam on lam phuc minh sap phai nop bai cho co roi
x la so nguyen
Tim x
|2.x-1|-1=2
Chu y : bai nay co 2 dap an la 2;(-1)nhung minh k biet cach trinh bay. Ai lam nhanh, gọn minh tick cho
4.120[45:9+15(x+1)=500 ai ma giai duoc bai nay (nho ghi cach lam ) thi minh se cho like lun do co hoi co han lam chi co 1 lan like la thoi nhanh tay len cac anh chi em oi lam quen nhe!!!!
Cau1.Hay tinh hop li cac tong sau day
a) A=1/3+1/3^2+1/3^3+....+1/3^100
b)B=10/56+10/140+10/260+....+10/1400
Cau2
Cho C=2+2^2+2+3+...+2^99+2^100
a)Tinh tong C
b)Tim x de2^2x-1-2=C
c)Chung minh rang C chia het ch 31
Cau 3
a) So sanh: A=2005^2005+1/2005^2006+1 va B=2005^2004+1/2005^2005+1
b)Tim so nguyen m sao cho so m+6/m-1 la so nguyen
Cau4
Cho AB=x(cm) AC=7(cm) BC=2x-1(cm) .Timx sao cho ba diem A B C thang hang
Cau 5
a) Tim x,y thuoc N biet 2^x+624=5^y
b)Voi gia tri nao cua x ,y thi bieu thuc A=/x-y/+/x+1/+2013 dat gia tri nho nhat .Tim gia tri nho nhat do
Chu y dau ''/'' la dau gia tri tuyet doi
Cau 6
De chuan bi cho ki thi hoc sinh gioi, mot hoc sinh giai 35 bai toan.Biet rang cu moi bai dat loai gioi duoc thuong 20 diem moi bai dat loai kha trung binh duoc thuong 5 diem . Con moi bai yeu, kem bi tru 10. Lam xong 35 bai em do duoc thuong 130 diem .Hoi co bao nhieu bai loai gioi ,bao nhieu bai loaiyeu ,kem .Biet rang co8 bai kha va trung binh
Ai lam dung minh tich cho
Nho giai ra nha
bai nay lam sao vay anh chi 5 nhan x - 10 = 25 con bai nay lam sao vay 5 [x - 10 ] = 25
Chung minh : 19^93 -19^39 chia het cho 18
giup minh nhe ,neu lam bai thi co ca trinh bay nua nhe, can on cac ban
bai 1
cho tong : S = 5 + 8 + 11 +14 = ....
a) tim so hang thu 100 cua tong
b) tinh tong 100 so hang dau tien
bai 2
cho tong : S = 7 + 12 + 17 + 22 + .......
a) tim so hang thu 50 cua tong
b) tinh tong 50 so hang dau tien
bai 3
tinh tong cua tat ca cac so hang tu nhien x , biet x la so tu nhien co 2 chu so va 12 < x <91
ban nao lam ho minh 3 bai tren voi ma ban nao nao lam ra dau tien minh se tich ngay va lun
Ai dang hoc lop 6 doi tuyen thi kb voi mk nhe
khi nao co bai ko hieu mik can hoi lam
