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a: \(24,8:0,5+24,8\cdot3+24,8:0,2\)
\(=24,8\cdot2+24,8\cdot3+24,8\cdot5\)
\(=24,8\left(2+3+5\right)\)
\(=24,8\cdot10=248\)
b: \(19,5+19,5\cdot3+19,5:0,5+19,5:0,25\)
\(=19,5+19,5\cdot3+19,5\cdot2+19,5\cdot4\)
\(=19,5\left(1+3+2+4\right)\)
\(=19,5\cdot10=195\)
c: \(121,07\cdot4+121,07:0,25+121,07:0,5\)
\(=121,07\cdot4+121,07\cdot4+121,07\cdot2\)
\(=121,07\left(4+4+2\right)\)
\(=121,07\cdot10=1210,7\)
\(-2\dfrac{3}{4}.\left(-0,4\right)+1\dfrac{2}{5}.2,75-\left(-1,2\right):\dfrac{4}{11}\)
\(=\dfrac{11}{4}.\dfrac{2}{5}+\dfrac{7}{5}.\dfrac{11}{4}+\dfrac{6}{5}.\dfrac{11}{4}\)
\(=\dfrac{11}{4}.\left(\dfrac{2}{5}+\dfrac{7}{5}+\dfrac{6}{5}\right)\)
\(=\dfrac{11}{4}.\dfrac{15}{5}\)
\(=\dfrac{11}{4}.3\)
\(=\dfrac{33}{4}\)
\(x\)x 54,4 = 25,7-678,5
\(x\)x 54,4= -652,8
\(x\)= -652,8 : 54,4
\(x\)= -12.
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X x54,4=678,5-25,7
X x 54,4=.......
X=......x54,4
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\(-2\dfrac{3}{4}.\left(-0,4\right)+1\dfrac{3}{5}.2,75-1,2:\dfrac{4}{11}\)
\(=\dfrac{11}{4}.\dfrac{-2}{5}+\dfrac{8}{5}.\dfrac{11}{4}-\dfrac{6}{5}:\dfrac{4}{11}\)
\(=\dfrac{11}{4}.\dfrac{-2}{5}+\dfrac{8}{5}.\dfrac{11}{4}-\dfrac{6}{5}.\dfrac{11}{4}\)
\(=\dfrac{11}{4}\left(\dfrac{-2}{5}+\dfrac{8}{5}-\dfrac{6}{5}\right)\)
\(=\dfrac{11}{4}.0\)
\(=0\)
\(\frac{-1275}{100}-2,75:\left(\frac{-11}{4}.x+11\right)=\frac{-27}{2}\)
\(2,75:\left(\frac{-11}{4}.x+11\right)=\frac{-1275}{100}-\frac{-27}{2}\)
\(2,75:\left(\frac{-11}{4}.x+11\right)=\frac{-51}{4}-\frac{-54}{4}\)
\(2,75:\left(\frac{-11}{4}.x+11\right)=\frac{3}{4}\)
\(\frac{-11}{4}.x+11=2,75:\frac{3}{4}\)
\(\frac{-11}{4}.x+11=\frac{11}{4}:\frac{3}{4}\)
\(\frac{-11}{4}.x+11=\frac{11}{4}.\frac{4}{3}\)
\(\frac{-11}{4}.x+11=\frac{11}{3}\)
\(\frac{-11}{4}.x=\frac{11}{3}-11\)
\(\frac{-11}{4}.x=\frac{11}{3}-\frac{33}{3}\)
\(\frac{-11}{4}.x=\frac{-22}{3}\)
\(x=\frac{-22}{3}:\frac{-11}{4}\)
\(x=\frac{-22}{3}.\frac{4}{-11}\)
\(x=\frac{8}{3}\)
Vậy \(x=\frac{8}{3}\)
\(=\dfrac{11}{4}\cdot\dfrac{2}{5}-\dfrac{8}{5}\cdot\dfrac{11}{4}+\dfrac{-6}{5}\cdot\dfrac{11}{4}\)
=11/4x(-12/5)=-132/20=-33/5
\(2\frac{2}{4}\cdot\left(-0,4\right)-1\frac{2}{3}\cdot2,75+1,2:\frac{4}{11}\)
\(=\frac{5}{2}\cdot\left(\frac{-2}{5}\right)-\frac{5}{3}\cdot\frac{11}{4}+\frac{6}{5}:\frac{4}{11}\)
\(=\left(-1\right)-\frac{55}{12}+\frac{33}{10}\)
\(=\frac{137}{-60}\)