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theo mk nghĩ ;
(5x - 7)2 + (6-5y)2 + (5z)2 = 10
chi xay ra khi 4+4+2 (loại) vi k có so nao binh phuong =2
vay 9+1+0 =10 ta co;
x = 2
y=1
z=0
(hop ly va duy nhat)
tim x y thuoc z biet x mu 2 cong y nhan x cong y mu 2 bang x mu hai nhan y mu hai
bai 1 ;chung minh rang abcd chia het 99 thi ab cong cd chia het 99 va nguoc lai
bai 2;a.8 mu 10 tru 8 mu 9 tru 8 mu 8 chia het 55
b.7mu 6 cong 7 mu 5 tru 7 mu 4 chia het 11
d.10 mu 9 cong10 mu 8 cong 10 mu 7 chia het 555
c.81mu 7 cong 27 mu 9 tru 9 mu 13 chia het 45
tim x y nguyen biet
x mu2 +y mu 2-z mu 2+z+1=2(x+y-xy)
5 mu 6 cia 5 mu 3 cong 3 mu2 nhan 3 mu 3 tru 3 mu 4 nhan 3
n>2.CMR NEU N CHIA HET CHO 3 THI N MU 2 TRU 1 VA N MU 2 CONG 1 KO DONG THOI CUNG LA SO NGUYEN TO
2 mu m cong 2 mu n bang 2 mu m cong n tim m va n
Tim 3 so nguyen co tong bang -4, biet rang so thu nhat nhan 2, so thu hai cong voi 3, so thu 3 tru di 4 thi duoc cac ket qua bang nhau. Tim ba so do?
AI TRA LOI DUNG SE DUOC TICK 10 CAI
tim so tu nhien x
3 mu x cong 3 mu x cong 1 cong 3 mu x cong 2 = 1053
3 mu x cong 2 cong 3 mu x bang 10