tim chu so thich hop thay vao x,y,m,n biet xy,mn-0,xy
cac ban giai bang cach lam cua cap 1 nha
khi cong hai so thap phan , ban A da viet nham dau phay cua mot so hang sang ben phaimot chu so nen co ket qua la 692,22 . Em hay tim 2 so da cho biet tong cua chung bang 100,56
cac ban giai theo cach lam cap 1 nha
tim phan so a/b biet rang neu them 9 vao tu so va them 15 vao mau so thi gia tri cua phan so khong thay doi
giai thich cach lam ho minh luon nha
a)Tim cap so tu nhien x,y biet (x-2)(y-3)=5
b)Cho p la so nguyen to lon hon 3.Chung minhh rang: (p-1)(p+1) chia het cho 24
c)Tong cua nam so tu nhien lien tiep co tan cung bang chu so nao?(co giai thich)
LAM NHANH GIUP MINH NHA
Thay a va b bang chu so thich hop.
a,b x 0, a x 0,b = 0,bbb
Ai viet ca cach giai mik se k cho
a,b . 0,a . 0,b = 0,bbb
a,b . a : 10 . b : 10 = 0,bbb
a,b . a.b : 100 = 0,bbb
a,b . a . b = bb,b
ab : 10 . a . b = bb,b
ab . a . b = bbb
ab . a . b = b . 111
=> ab . a = 111
Có 111 = 37 . 3
=> a = 3 ; b = 7
Theo bài ra, ta có : a,b x 0,a x o,b = 0,bbb
=> a,b x 10 x 0,a x 10 x 0,b x 10 = 0,bbb x 10 x 10 x 10
ab x a x b = bbb
ab x a x b = b x 111
ab x a = 3 x 37
Vậy a = 3 và b = 7. Thay vào ta có : 3,7 x 0,3 x 0,7 = 0,777
Tim so tu nhien x biet tong cac chu so cua x bang y , tong cac chu so cua y bang z va x+y+z=60
trinh bay cach lam ra nhe
Mot cua hang co 250 hop keo ,cua hang da ban 1/5 so keo.Thi con lai 3000 vien keo.tim so vien keo ban dau?
GIAI BANG 2 CACH ,BAN NAO KHONG BIET THI GIAI BANG 1 CACH CUNG DUOC
CAU 1: Viet them hai chu so thich hop vao day so sau
1 , 2, 3, 5, 8 , ...............
CAU 2: Tim so tu nhien x biet
(x+1) + (x+2) + (x+3) + ...... + (x+100) = 5050
CAU 3 : Mot manh dat hinh thang co day nho bang 150m , day lon bang 5/3 day nho , chieu cao bang 2/5 day lon . Hoi dien tich manh dat bang bao nhieu hec ta ?
CAU 4 : Trung binh cong cua ba so la 38 , trong do so thu nhat 2 lan so thu ba . Neu gap doi so thu nhat va so thu hai thi trung binh cong cua chung bang 67 . Tim ba so do
LAM CHI TIET HO MINH NHA . LAM LUON HO MINH NHA DANG CAN GAP . CAM HON NHIU
1) tim so tu nhien x,biet
A)(x-35)-120=0
B)124+(118-x)=217
C)156-(x+61=82
2) tinh nham bang cach them vao o so nay.bớt di cua so hang kia cung mot so tjich hop
Vi du:57+96=(57-4)+(96+4)=53+100=153
Hay tinh nham 35+98
46+29
3)tinh nham bang cay them vao so tru va so bi tru cung mot so thich hop
Vi du:135-98=(135+2)-(98+2)=137-100=37Hay tinh nham 321-96
1354-997
(x-35)-120=0
=>x-35 = 0+120
=>x-35=120
=>x=120+35
=>x=155
tíc mình nha
thay cac chu cai ab vao cac so cho thich hop de lam phep nhan
ab.aba=abab
ai lam nhanh co loi giai hop le minh se tick