\(B=\dfrac{14}{38\cdot31}+\dfrac{10}{38\cdot43}+\dfrac{6}{43\cdot46}+\dfrac{22}{46\cdot57}\)
=2(7/31*38+5/38*43+3/43*46+11/46*57)
=2(1/31-1/38+1/38-1/43+...+1/46-1/57)
=>A/B=5/2
tìm tỉ số A/B
A= \(\frac{4}{7x31}+\frac{6}{7x41}+\frac{9}{10x41}+\frac{7}{10x51}\)
B= \(\frac{7}{19X31}+\frac{5}{19X43}+\frac{3}{23X43}+\frac{11}{23X57}\)
A=4/7x31+6/7x41+9/10x41+7/10x57
B=7/19X31+5/19/43X3/23X43+11/23X57
Tính A/B
tìm tỉ số của A và B; A = 1/7x31 + 1/6x41 + 9/10x41 + 7/10x57; B = 7/19x31 + 5/19x43 + 3/23x43 + 11/23x57.
\(\frac{4}{7x31}+\frac{6}{7x41}+\frac{9}{10x41}+\frac{7}{10x57}\)
A= 4/7x31+6/7x41+9/10x41+7/10x57
Tính A
Giúp mik nhanh vs m.n!! Đang cần gấp. Sẽ tick cho ai nhanh nhất ^^
A = 4 / 7x31 + 6 / 7x41 +9 / 10 x41 + 7 / 10 x57
B = 7 / 19 x 31 + 5 / 19 x 43 + 3 / 23 x43 + 11 / 23 x 57
A/B = ????
tinh nhanh 4/7x3+6/7x41+9/10x41+7/10x57
A=40/3 x38 + 35/39x46 + 30/2392 + 25/2962 va B=91/19x31 + 65/19x43 + 39/989 + 143/1311.Tinh A/B
B=7/19X31 5/19/43X3/23X43 11/23X57 Tính A/B
