$\frac{-3}{26}$+2$\frac{4}{69}$
tính
a,\(\frac{-3}{26}+2\frac{4}{69}\)
tính
a,\(\frac{-3}{26}+2\frac{4}{69}\)
b,\(-2.\frac{-38}{21}.\frac{-7}{4}.-\frac{3}{8}\)
nhanh nhanh dùm mk nha!ai nhanh và đúng mk tick cho
Tính:
b) \(-2.\frac{-38}{21}.\frac{-7}{4}.-\frac{3}{8}\)
= \(\frac{\left(-2\right).\left(-38\right).\left(-7\right).\left(-3\right)}{21.4.8}\)
= \(\frac{-1.-19.1}{1.2.4}=\frac{19}{8}\)
// Học tốt!
\(A=\frac{1}{71}+\frac{2}{70}+\frac{3}{69}+\frac{4}{68}+...+\frac{70}{2}+\frac{71}{1};B=\frac{1}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+...+\frac{1}{71}+\frac{1}{72}}AxB=?\)
\(1.a.\frac{3}{4}.\frac{1}{210}-\frac{1}{21}.\frac{6}{5}.\frac{1}{4}\)
\(b.\frac{85}{26}:0,185-\frac{59}{26}:0.185\)\(c.2+\frac{2}{2+\frac{2}{2+\frac{2}{2+\frac{1}{2}}}}\)
a: \(=\dfrac{1}{280}-\dfrac{1}{70}=\dfrac{1}{280}-\dfrac{4}{280}=-\dfrac{3}{280}\)
b: \(=\dfrac{200}{37}\left(\dfrac{85}{26}-\dfrac{59}{26}\right)=\dfrac{200}{37}\)
c: \(=2+\dfrac{2}{2+\dfrac{2}{2+\dfrac{2}{\dfrac{5}{2}}}}=2+\dfrac{2}{2+\dfrac{2}{2+\dfrac{4}{5}}}=2+\dfrac{2}{2+\dfrac{5}{7}}\)
\(=2+2:\dfrac{19}{7}=2+\dfrac{14}{19}=\dfrac{38+14}{19}=\dfrac{52}{19}\)
Tính bằng cách hợp lý
\(11\frac{4}{5}-\left(17\frac{3}{4}+11\frac{4}{5}\right)+2\frac{3}{4}\)\(4\frac{11}{23}+3\frac{4}{5}-2\frac{11}{23}\)\(\frac{-27}{26}-\frac{-5}{21}+\frac{1}{26}+\frac{16}{21}+50\%\)\(-2\frac{2}{3}+\left(-0,2\right)+1.75-\frac{5}{0}+0,7\)
\(34-\left\{20-[\frac{4}{3}-2(5+\frac{4}{3})]-26\right\}+\frac{4}{3}\)
= 34 - { 20 - [ 4/3 - 2.19/3] - 26} + 4/3
= 34 - {20 +34/3 - 26} + 4/3
= 34 - 16/3 + 4/3
= 30
\(3\frac{1}{2}+15\frac{4}{9}:\frac{26}{17}-2\frac{4}{9}:3\frac{5}{7}\)
1. Tìm các a, b và c, biết :
a. 2a = 3b = 4c và a + b + c = 26
b.\(\frac{a}{3}=\frac{b}{8}=\frac{c}{5}\) và 3a = b. 2c=14
c.\(\frac{x}{5}=\frac{y}{6};\frac{y}{8}=\frac{2}{7}\) và x + y = z = 69
Giúp mik nha mình sẽ tik cho
xin lỗi vì chửi hưi quá miệng hahaha
\(\frac{3}{2x+4}+\frac{10}{4x+2}+\frac{6}{6x+3}=\frac{12}{26}\)