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a: =(41,5+15,5)x4=57x4=228
b: =13,6x8+34,4x8=50x8=400
c: =135 giây+135 giây+135 giây x8
=135x10=1350 giây
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\(\frac{3}{4}+6,8+0,25+0,5+\frac{1}{5}+\frac{1}{2}\)
\(=0,75+6,8+0,25+0,5+0,2+0,5\)
\(=\left(0,75+0,25\right)+\left(6,8+0,2\right)+\left(0,5+0,5\right)\)
\(=1+7+1\)
\(=9\)
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1/2.1/3+1/3.1/4+1/4.1/5+1/5.1/6
=1/2.3+1/3.4+1/4.5+1/5.6
=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=1/2-1/6
=2/6=1/3
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\(x-\frac{3}{4}=6\cdot\frac{3}{8}\)
\(x-\frac{3}{4}=\frac{9}{4}\)
\(x=\frac{9}{4}+\frac{3}{4}\)
\(x=\frac{12}{4}=3\)
\(\frac{7}{8}\cdot x=3-\frac{1}{2}\)
\(\frac{7}{8}\cdot x=\frac{5}{2}\)
\(x=\frac{7}{8}:\frac{5}{2}\)
\(x=\frac{7}{20}\)
\(x+\frac{1}{2}\cdot\frac{1}{3}=\frac{3}{4}\)
\(x+\frac{1}{6}=\frac{3}{4}\)
\(x=\frac{3}{4}-\frac{1}{6}\)
\(x=\frac{7}{12}\)
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1 : ( 0,3 + x ) = 5\(\frac{1}{2}\). 1/4
1 : ( 0,3 + x ) = 11/2 . 1/4
1 : ( 0,3 + x ) = 11/8
0,3 + x = 1 : 11/8
0,3 + x = 8/11
x = 8/11 - 0,3
x = 47/110
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