\(1\frac{1}{2}\cdot x-\left(x+3\right)=\frac{1}{2}\)
\(\frac{3}{2}\cdot x-x-3=\frac{1}{2}\)
\(\frac{1}{2}\cdot x=\frac{1}{2}+3\)
\(\frac{1}{2}\cdot x=\frac{7}{2}\)
\(x=\frac{7}{2}:\frac{1}{2}\)
x = 7
\(1\frac{1}{2}\cdot x-\left(x+3\right)=\frac{1}{2}\)
\(\frac{3}{2}\cdot x-x-3=\frac{1}{2}\)
\(\frac{1}{2}\cdot x=\frac{1}{2}+3\)
\(\frac{1}{2}\cdot x=\frac{7}{2}\)
\(x=\frac{7}{2}:\frac{1}{2}\)
x = 7
(x-1)nhan(y+10)=5
(x+2)nhan(y-3)=-3 tim y va x
tim x thuoc n biet : b,(149 nhan 35 : x + 5) nhan 17 =13 va d/(3 nhan x tru 3 ) binh phuong 3 =2 nhan 32 e/5 x+1-5x=500
cho A = 1/15 nhan 225/(8+2) + 3/14 nhan 196/(3x+6) (x thuoc Z; x khac -2 )
a) Rut gon A
b) Tim x thuoc Z de A thuoc Z
c) trong cac gia tri nguyen A tim gia tri lon nhat va gia tri nho nhat
Bai 1: a)Tim so tu nhien a biet 1960va2002 chia cho a cung co so du la 28
b)Tim 2 sop tu nhien a va b , biet :BCNN(a,b)=300;UCLN(a,b)=15 va a+15=b
Bai 2:a)Tong sau la binh phuong so nao ?
S=1+3+5+7+...+199
b) Cho so ab va so ababab
1)chung to ababab la boi cua ab
2)So 3 va 10101 co phai la uoc cua ababab khong , vi sao?
Bai 3
a)Hay viet them dang sau so 664 ba chu so de nhan duoc sdo co 6 chu so chia het cho 5,9,11
b)Tim so nguyen x thuoc Z biet rang :
(x^2-1)(x^2-4)<0
Bai 4 :tim so nguyen x va y biet: xy-x+2y=3
tim x 5/8 nhan gia tri tuyet cua x-2/3=-1/4
1,tim cac so nguyen x,y biet: -2/x=y/3 va x<0<y
2, Tim cac so nguyen x,y biet:x-3/y-2=3/2 va x-y=4
1 TIM X
a,(x^2+5) nhan (x^2-25)=0
b,(x^2-5)nhan (x^2-25)<0
1.tim tat ca UC cua 2 STN
2.tim ƯC cua 2n+1 va 3n+1
3.
tim STN sao cho x+10 chia het 5, x-18 chia het 6, x+21 chia het 7 va 500<x<700
bai 1; so sanh
a, 3 mu 600 va 2 mu 900 b, 2 mu 360 va 3 mu 240
c, 3 mu 236 va 2 mu 354
bai 2,tim x biet ;
a,5 mu x + 5 mu x +2 =650
b, 2 mu x +3 +5 nhan 2 mu x +2 - 2 mu x + 1 = 208
bai 3,tinh tong;A=3 + 3 mu 2 + 3 mu 3 +3 mu 4 +.........+3 mu 2019 +3 mu 2020