A = \(\dfrac{1}{2}\) - \(\dfrac{1}{5}\) + \(\dfrac{1}{5}\) - \(\dfrac{1}{8}\) + \(\dfrac{1}{8}\) - \(\dfrac{1}{11}\) + \(\dfrac{1}{11}\) - \(\dfrac{1}{14}\) + \(\dfrac{1}{14}\) - \(\dfrac{1}{17}\) + \(\dfrac{1}{17}\) - \(\dfrac{1}{20}\)
= \(\dfrac{1}{2}\) - \(\dfrac{1}{20}\)
= \(\dfrac{9}{20}\)
A = 3/2x5 + 3/5x8 + 3/8x11 + 3/11x14+ 3/14x17+ 3/17x20
A nhanh tay mình cho 1 like nha
A=3/2x5+3/5x8+3/8x11+...+3/17x20
tính nhanh
a) \(\dfrac{5}{7}x\dfrac{3}{2}+\dfrac{3}{2}x\dfrac{9}{7}\)
b)\(\dfrac{4}{5}+\dfrac{4}{5}x6+3x\dfrac{4}{5}\)
sos
3/2x5 + 3/5x8 + 3/8x11 + 3/11x14 + ••• + 3/20x22
Tinh nhanh: A=1/ 2x5 + 1/5x8 + 1/8x11 + 1/11x14 + 1/14x17
tính tổng sau cho hợp lí
A= 3/2x5+3/5x8+3/8x11+...+3/17x20
Tính :
\(\dfrac{1}{2}\) + \(\dfrac{1}{3}\) - \(\dfrac{1}{5}\)
\(\dfrac{1}{5}\) : \(4\) + \(\dfrac{3}{4}\)
\(\dfrac{4}{3}\) x \(\dfrac{9}{5}\) - \(\dfrac{3}{10}\)
Bài 1 : TÍNH
\(\dfrac{2}{3}+\dfrac{3}{10}\) ; \(\dfrac{2}{3}-\dfrac{5}{8}\) ; \(\dfrac{3}{7}\) x \(\dfrac{4}{9}\) ; \(\dfrac{5}{6}:\dfrac{4}{3}\)
BÀI 2 : TÌM \(x\)
a) \(\dfrac{5}{4}-x\) bằng \(\dfrac{2}{3}\) b) \(x:\dfrac{3}{5}b\text{ằng}4\)
giải giúp mik với. đi mà. làm ơn. GIẢI RÕ RÀNG VÀ Đ CHO MIK VỚI NHA. CẢM ƠN AH
Tính :
a) 7 x \(\dfrac{3}{14}\) - \(\dfrac{1}{14}\) b) \(\dfrac{3}{2}\) + \(\dfrac{7}{4}\) x \(\dfrac{2}{5}\)
c) \(\dfrac{9}{8}\) : 3 + \(\dfrac{7}{8}\) : 3 d) 2 : \(\dfrac{3}{4}\) - \(\dfrac{5}{8}\) x \(\dfrac{4}{3}\)
