\(\frac{5}{7}\)x X = \(\frac{4}{7x31}\)+\(\frac{6}{7x41}\)+\(\frac{9}{10x41}\)+\(\frac{7}{10x57}\)
Những câu hỏi liên quan
\(\frac{4}{7x31}+\frac{6}{7x41}+\frac{9}{10x41}+\frac{7}{10x57}\)
Đặt A là tên của biểu thức
\(A=\frac{4}{7.31}+\frac{6}{7.41}+\frac{9}{10.41}+\frac{7}{10.57}\)
\(=\frac{20}{31.35}+\frac{30}{35.41}+\frac{45}{41.50}+\frac{35}{50.57}\)
\(=5\left(\frac{4}{31.35}+\frac{6}{35.41}+\frac{9}{41.50}+\frac{7}{50.57}\right)\)
\(=5\left(\frac{1}{31}-\frac{1}{35}+\frac{1}{35}-\frac{1}{41}+\frac{1}{41}-\frac{1}{50}+\frac{1}{50}-\frac{1}{57}\right)\)
\(=5\left(\frac{1}{31}-\frac{1}{57}\right)=5\cdot\frac{26}{1767}=\frac{130}{1767}\)
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5/57 x x = 4/7x31 + 6/7x41 + 9/10x41 + 7/10x57
Giúp mình với
A=\(\dfrac{4}{7x31}\)+\(\dfrac{6}{7x41}\)+\(\dfrac{9}{10x41}\)+\(\dfrac{7}{10x57}\)
\(A=\dfrac{20}{35\cdot31}+\dfrac{30}{35\cdot41}+\dfrac{45}{41\cdot50}+\dfrac{35}{50\cdot57}\)
=5(4/31*35+6/35*41+9/41*50+7/50*57)
=5(1/31-1/35+1/35-1/41+1/41-1/50+1/50-1/57)
=5*(1/31-1/57)
=130/1767
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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+5/19X43+3/23X48+11/23X57
Tính A/B
\(B=\dfrac{14}{38\cdot31}+\dfrac{10}{38\cdot43}+\dfrac{6}{43\cdot46}+\dfrac{22}{46\cdot57}\)
=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
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A=4/7x31+6/7x41+9/10x41+7/10x57
B=7/19X31+5/19/43X3/23X43+11/23X57
Tính A/B
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 ^^
tinh nhanh 4/7x3+6/7x41+9/10x41+7/10x57
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.
