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4\(\dfrac{2}{5}\) - 2,5 \(\times\) \(x\) = 3 \(\times\) \(\dfrac{2}{9}\)
\(\dfrac{22}{5}\) - \(\dfrac{5}{2}\) \(\times\) \(x\) = \(\dfrac{2}{3}\)
\(\dfrac{5}{2}\) \(\times\) \(x\) = \(\dfrac{22}{5}\) - \(\dfrac{2}{3}\)
\(\dfrac{5}{2}\) \(\times\) \(x\) = \(\dfrac{56}{15}\)
\(x\) = \(\dfrac{56}{15}\): \(\dfrac{5}{2}\)
\(x\) = \(\dfrac{112}{75}\)
Bài 1:
a) \(\dfrac{65}{91}+\dfrac{-33}{55}=\dfrac{5}{7}+\dfrac{-3}{5}=\dfrac{25}{35}+\dfrac{-21}{35}=\dfrac{4}{35}\)
b) \(\dfrac{36}{-84}+\dfrac{100}{450}=\dfrac{-3}{7}+\dfrac{2}{9}=\dfrac{-27}{63}+\dfrac{14}{63}=\dfrac{-13}{63}\)
3/5 . 11/7 + 3/5 . (- 4/7) + 2/5
= 3/5 . [11/7 + (- 4/7)] + 2/5
= 3/5 . 1 + 2/5
= 3/5 + 2/5
= 1
\(\left(4x-5\right)\left(2x+30\right)-4\left(x+2\right)\left(2x-1\right)+\left(10x+7\right)\)
\(=8x^2+110x-150-8x^2-12x+8+10x+7\)
\(=108x-135\)
(2/3-3/4)^2 x 12/7-5/7 = -15/49
nha bạn chúc bạn học tốt nha