gọi số thứ nhất là a; số thứ 2 là b, ta có:
\(a.b=6210\Rightarrow a=\frac{6210}{b}\)
\(\left(a-7\right).b=5265\)\(\Rightarrow ab-7b=5265\Rightarrow\frac{6210}{b}b-7.b=5265\)
\(\Rightarrow6210-7b=5265\Rightarrow7b=945\)
\(\Rightarrow b=135\)
\(\Rightarrow a=46\)
Vậy \(\orbr{\begin{cases}a=46\\b=135\end{cases}}\)
tich 2 so tu nhien la 6210 neu giam 1 thua so di 7 don vi thi tich moi la 5265 tim 2 so
bai 1;tinh gia tri bieu thuc 17a+15b+6a+8b voi a+b =100
bai 2;tich cua 2 so la 6210.neu giam 1 thua so di 7 don vi thi tich moi la 5265.tim cac thua so cua tich
bai 3;co 5 so tu nhien nao ma tich cua chung bang1001 va chu so tan cung la 6
bai 4;tinh;333...3.999...9 trong do co 50 chu so 3 va 50 chu so 9
Tich cua hai so =360.neu bot 3 don vi o thua so va thua so kia giu nguyen thi tich moi la 270. tim 2 so
Neu tang them 5 don vi vao thua so thu nhat thi tich moi la 595. Tim 2 thua so biet tich cua chung bang 420.
tim hai so tu nhien biet rang tich cua chung la 630 va neu them 4 don vi vao mot thua so thi tich moi la 798
1. mot phep chia co tong cua so bi chia va so chia bang 72. biet rang thuong la 3 va so du la 8. tim so bi chia va so chia
2. TIm hai so tu nhioen .biet rang tich cua chung la 630 va neu them 4 don vi va mot thua so thi tich moi la 798
tich cua 2 phan so la 2/5. Neu ta them vao thua so thu hai 3 don vi thi duoc tich la 28/15. tim 2 phan so do?
Tich cua hai phan so la 3/7 neu them vao thua so thu nhat 2 don vi thi tich la 13/21. Tim hai phan so do.
Ai giai that chi tiet va de hieu thi minh tick cho.
tich cua 2 so la 444.neu them 3 don vi vao so nhan thi tich moi la 555.tim 2 so do
