Các câu hỏi tương tự
tim x
a, 3^x=3^2*9
b, (21+x):9=9^5:9^4
c, 5^x-1-13=613
1)a)2x-13=25+6x
b)12-x=3x+6
c)40-(25-2x)=x
d)|x-3|=5
e)|x-3|+(x+2)+(x+1)=12
2)tính
a)(-1).(-2).(-3).(-4).(-5).[(-3)-(-5)]
b)1-2+3-4+5-6+...-98+99
3)tim x
a)(x-1).(y-2)=5
b)x.(y-3)=12
Tim so nguyen x biet:
a,x-(-24)=3
b,(x+5)-(x-9)=x+3
c,c(x+2)=0
d,(x-1)^2=0
e,x^2-3x=0
f,-13-(6-|x+1|)=24
g,26-|x+9|=-13
i,(3x-6).3=3^4
Tim số nguyên x
A:1-(4.x+13)=3-x
B:(-12)^2.x=56-(-10).13.x
C:3.x-(-15)-(-10)=15+x
Bai 1: Tinh nhanh:a, -69+53+46+(-14)+78 b, 13-12+11+10-9+8-7-6+5-4+3+2-1Bai 2: a,Tim gia tri nho nhat cua bieu thuc: A |x+19|+|y-5|+1890 b, Tim gia tri lon nhat cua bieu thuc: B -|x-7|-|y+13|+1945Bai 3: Tim x,y thuoc Z biet: a, xy-3x -19 b, 3x+4y-xy 16Bai 4: Tim x thuoc Z biet: a, x.(x+3) 0 b, (x-2) (5-x) 0 c, (x+1) (x2+1) 0 d, -12 (x-5)+7 (3-x) 5 e, 30 (x+2)-6 (x-5)-24x 100 f, (x+1)+(x+3)+(x+5)+. . .+(x+99) 0 ...
Đọc tiếp
Bai 1: Tinh nhanh:
a, -69+53+46+(-14)+78 b, 13-12+11+10-9+8-7-6+5-4+3+2-1
Bai 2: a,Tim gia tri nho nhat cua bieu thuc: A= |x+19|+|y-5|+1890
b, Tim gia tri lon nhat cua bieu thuc: B= -|x-7|-|y+13|+1945
Bai 3: Tim x,y thuoc Z biet: a, xy-3x= -19 b, 3x+4y-xy= 16
Bai 4: Tim x thuoc Z biet: a, x.(x+3)= 0 b, (x-2) (5-x)= 0 c, (x+1) (x2+1)= 0
d, -12 (x-5)+7 (3-x)= 5 e, 30 (x+2)-6 (x-5)-24x= 100 f, (x+1)+(x+3)+(x+5)+. . .+(x+99)= 0
Minh xin cam on truoc ! THANK YOU
cho A = 1 -2 + 3 - 4 + 5 - 6 + ....... + 19 - 20
a, A co chi het ch2, cho 3, cho 5 khong?
b, tim x biet: 1 + 5 + 9 + 13 + 16 + ..... + x
1.Tim x
a, ( - 29 ) - 9 . ( 2 . x - 1 )2 = - 110
b, ( - 2 ) .( - x - 5 ) + 28 = 20 - 3 . ( x + 4 )
2. Chung minh dang thuc sau
- ( -a + b - 26 ) + ( - 3 . b + a - 13 ) - 20 = - 2 . ( 2 .. b - a + 1 ) + ( - 5 )
1. tinh :
a) 15/8 + 3/4 - 5/12
b) 11/24 x 12/33 + 5/6
c) 15/8 + 7/24 : 5/8
2 . tim x, biet :
a) x + 5/8 : 3/4 = 17/9
b) x - 5/9 x 18/15 = 1/3
c) x x7/8 - 5/8 = 13/24
d) X x1/7 + X x 1/4 + X x 1/4 =18
giup mik nhanh nha. mik can gap lam
Tim cac cap so nguyen x,y biet
a,xy=-5
b,(x+2)(2y-3)=8
c,(x-2)^2+(2x-y)^4=0
d,|x|+|y|=1
e,|2x+1|+|y|=4
f,|x-13|+|2y-8|<hoac= 0
g,|x-5|+|y+2|=2
h,|x+3|+|2y+1|=3