Tính nhanh
a)(925.15+925.3):(926.3-926)
b)[(73.3+72.6.7)+(32.4.2+33.5)]:9
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`a)=(6xx8xx5xx3)/(5xx5xx6xx3xx8)=(1)/5`
`b)=5/8xx(9/7+5/7)`
`=5/8xx2=10/8=5/4`
A,\(\dfrac{6x8x15}{25x6x24}=\dfrac{6x8x5x3}{5x5x6x3x8}=\dfrac{1}{5}\)
Bài 2:
a: =>x-35=-23
=>x=12
b: =>|x-8|=13
=>x-8=13 hoặc x-8=-13
=>x=21 hoặc x=-5
Bài 1:
a: =42-98-42+12-12=-98
b: =10x4x3x(-25)=40x(-25)x3=-1000x3=-3000
\(a,2017\times\left(8+2\right)=2017\times10=20170\\ b,=\dfrac{3}{7}\times\left(\dfrac{9}{7}-\dfrac{2}{7}\right)=\dfrac{3}{7}\times1=\dfrac{3}{7}\)
a: \(=\dfrac{4\cdot11\cdot3}{4\cdot9}\cdot\dfrac{1}{121}=\dfrac{11}{121}\cdot\dfrac{1}{3}=\dfrac{1}{33}\)
b: \(=\dfrac{7}{9}\left(\dfrac{3}{4}+\dfrac{1}{4}\right)=\dfrac{7}{9}\)
c: \(=\dfrac{-6}{7}-\dfrac{1}{7}+\dfrac{2}{11}+\dfrac{9}{11}+\dfrac{12}{17}=\dfrac{12}{17}\)
\(=\left(\dfrac{5}{7}+\dfrac{9}{7}\right)\times\dfrac{3}{2}=2\times\dfrac{3}{2}=3\)
\(=\dfrac{4}{5}\times\left(6+1+3\right)=\dfrac{4}{5}\times10=\dfrac{40}{5}=8\)
a) 5/7 x 3/2 + 3/2 x 9/7
= (5/7 + 9/7) x 3/2
= 2 x 3/2
= 6/2 = 3
b) 4/5 + 4/5 x 6 + 3 x 4/5
= 4/5 x 1 + 4/5 x 6 + 3 x 4/5
= 4/5 x (1 + 6 + 3)
= 4/5 x 10
= 40/5 = 8
a: \(=\dfrac{5}{9}\cdot\dfrac{7}{4}+\dfrac{13}{9}\cdot\dfrac{7}{4}=\dfrac{7}{4}\cdot2=\dfrac{7}{2}\)
b: \(=\dfrac{14}{13}\cdot2+\dfrac{3}{13}\cdot2-2\cdot\dfrac{7}{13}=\dfrac{28}{13}+\dfrac{6}{13}-\dfrac{14}{13}=\dfrac{20}{13}\)
a: \(=\dfrac{9^{25}\cdot18}{9^{26}\cdot2}=\dfrac{1}{9}\cdot9=1\)
b: \(=\dfrac{7^3\cdot3+7^2\cdot42+3^2\cdot8+3^3\cdot5}{9}=\dfrac{7^2\cdot\left(7\cdot3+42\right)+3^2\left(8+3\cdot5\right)}{9}\)
\(=\dfrac{7^2\cdot63+3^2\cdot23}{9}=7^2\cdot7+23=343+23=366\)