(3^4×57+9^2×21) : 3^5
Mọi người giúp en nha :3
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a: =-5/6-3/7=-35/42-18/42=-53/42
b: =18/45-20/45=-2/45
c: =-24/35
d: =2/3x-5/4=-10/12=-5/6
\(\dfrac{-5}{6}+\dfrac{3}{7}=\dfrac{-5\times7+3\times6}{6\times7}=\dfrac{-17}{42}.\)
\(\dfrac{2}{5}-\dfrac{4}{9}=\dfrac{2\times9-4\times5}{5\times9}=\dfrac{-2}{45}.\)
\(\dfrac{-6}{5}\times\dfrac{4}{7}=\dfrac{-6\times4}{5\times7}=\dfrac{-24}{35}.\)
\(\dfrac{2}{3}:\dfrac{-4}{5}=\dfrac{2}{3}\times\dfrac{5}{-4}=\dfrac{-5}{6}.\)
\(\left(\dfrac{1}{2}+\dfrac{1}{3}\right)\times\dfrac{2}{5}=\dfrac{5}{6}\times\dfrac{2}{5}=\dfrac{2}{6}=\dfrac{1}{3}\)
\(\left(\dfrac{1}{2}+\dfrac{1}{3}\right)\times\dfrac{2}{5}=\left(\dfrac{3}{6}+\dfrac{2}{6}\right)\times\dfrac{2}{5}=\dfrac{5}{6}\times\dfrac{2}{5}=\dfrac{1}{3}\times\dfrac{1}{1}=\dfrac{1}{3}\)
( x - 1/2 ) : 3/11 =11/4
(2x + 3/8 ) . 7/4 =-21/32
x - x/3 = 3/57 : 12/19
nhanhh giúp tui nha các babee
( x - 1/2 ) : 3/11 =11/4
x - 1/2 = 11/4 x 3/11
x - 1/2 = 3/4
x = 3/4 + 1/2
x = 5/4
Vậy x = 5/4
(2x + 3/8 ) . 7/4 =-21/32
2x + 3/8 = -21/32 : 7/4
2x + 3/8 = -3/8
2x = -3/8 - 3/8
2x = -3/4
x = -3/4 : 2
x = -3/8
Vậy x = -3/8
\(=\dfrac{1}{3}\cdot57+\dfrac{1}{3}\cdot21=19+7=26\)
\(=\dfrac{1}{3}\cdot57+\dfrac{1}{3}\cdot21=\dfrac{1}{3}\cdot78=26\)