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1: =-2/9(15/17+2/17)=-2/9
2: \(=\dfrac{-6}{3}+\dfrac{-21}{90}\)
=-2-7/30=-67/30
3: \(=\dfrac{3}{4}\cdot\dfrac{7}{5}+\dfrac{9}{7}\cdot\dfrac{3}{2}\)
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
1: =-2/9(15/17+2/17)=-2/9
2: =−63+−2190=−63+−2190
=-2-7/30=-67/30
3: =34⋅75+97⋅32=34⋅75+97⋅32
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
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\(\dfrac{1}{9}=\dfrac{x}{27}\)
\(x=\dfrac{1}{9}\times27\)
\(x=3\)
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\(\frac{1}{27}=\left(\frac{1}{9}\right)^x\)
\(\Rightarrow\frac{1}{27}=\left(\frac{1}{3}\right)^{2x}\)
\(\Rightarrow\left(\frac{1}{3}\right)^3=\left(\frac{1}{3}\right)^{2x}\)
\(\Rightarrow2x=3\)
\(\Rightarrow x=\frac{3}{2}\)
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1).( 27,56 x 35 ) + ( 27,56 x 67 ) - ( 27,56 x 2)
= (964 + 1846,52) - 55,12
=2810,52 - 55,12
= 2755,4
2).( 4x 35 ) x ( 25 x 5 ) x 2
= ( 140 x 125 ) x2
= 17500 x 2
=35000
4). 3/10
5). 1188
6). 61/6
\(\dfrac{1}{9}=\dfrac{x}{27}\) ta có 27 : 9 = 3 nên x sẽ là 3 vì \(\dfrac{1\times3}{9\times3}=\dfrac{3}{27}\)
\(\dfrac{1}{9}=\dfrac{x}{27}\)
\(\dfrac{3}{27}=\dfrac{x}{27}\)
\(=>x=3\)