Các câu hỏi tương tự
(4x + 5 ) : 3 - 121 : 11 = 4
1 + 3 + 5 + ... + x = 1600 (x la mot so tu nhien le)
2x + 2x+3 =144
( x - 5)4 = ( x - 5)6
tim x la so tu nhien
1+3+5+....+x=3200 (x la so le)
(x+1)+(x+2)+(x+3)+....+(x+100)=5750
mik dag can gap
tim so tu nhien x de cac so sau la so nguyen to
a ,2 .x
b , 7 .x
c , 3 . [ x-6]
d,5-x
e,7-x
g,11-x
f, 11 .[x-15]
h,2 mu3 .b +3 mu 2 .b
Cho tam giac ABC co dien tich 180cm2.Tren canh AB lay diem D sao cho AD=8.Tren BC lay E sao cho BE=1/3 BC.Biet dien tich tam giac BDE la 12cm2.Tinh ABTim X
Xem chi tiết
a)1/5*7+1/7*9+1/9*11+...+2005*2011+1/X=1/5*0,5
b)1-(11 1/2[hon so]+X-10,1)/8 2/5[hon so]=0
c)1-(5 2/9[hon so]+X7 7/18[hon so])/2 1/6[hon so]=0
tinh hop li
1+3+5+..........+x=1600(so le)
tim x biet
1/3x+2/5(x-1)=4
1/2-1/3:3x0-=5
tim stn nho nhat chia cho 5, cho 7, cho 9 co so du theo thu tu la 3;4;5
Tinh tong: 1-5/6+7/12-9/20+11/30-13/42+15/56-17/12+19/90
tim so nguyen x
(a+3) la uoc cua 7
12 la boi cua (a+1)
( x-5) chia het cho ( x+1)
( x+2) la uoc (3×x-7)
Bài 2.Tìm x:
a) 2017-(x-17)=169:13
b) [(25-x).3+21]:2-4=23
c)1+3+5+...+x=1600
Giup mik giai bai toan nay,mik tick cho^_^
a,6/7+5/8:5-3/16(-2)2;b,2/3+1/3*(-2/3+5/6):2/3;c,1/1/2x-1/2=3/4;d,-3/5+(-2/5-99)
b,Tim x
a,(2/11+1/3)*x=(1/7-1/8)*56
*luu y:dau gach / la phan so,con so ma co hai dau nhu the nay:vd:7/1/7 la hon so nhe)