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1: 0,35*12,4=0,35*2,4+0,35*10=3,5+0,84=4,34
2: =0,1-2,34=-2,24
3: =5-2,9=2,1
4: \(=2,5\left(10,124-0,124\right)=10\cdot2,5=25\)
5: =-3/7+1/13
=-39/91+7/91
=-32/91
6: =-1/3+1/3=0
\(\frac{0,4-\frac{2}{9}+\frac{2}{11}}{1,4-\frac{7}{9}+\frac{7}{11}}-\frac{\frac{1}{3}-0,25+\frac{1}{5}}{1\frac{1}{6}-0,875+0,7}\)
\(=\frac{\frac{2}{5}-\frac{2}{9}+\frac{2}{11}}{\frac{7}{5}-\frac{7}{9}+\frac{7}{11}}-\frac{\frac{2}{6}-\frac{2}{8}+\frac{2}{10}}{\frac{7}{6}-\frac{7}{8}+\frac{7}{10}}\)
\(=\frac{2.\left(\frac{1}{5}-\frac{1}{9}+\frac{1}{11}\right)}{7.\left(\frac{1}{5}-\frac{1}{9}+\frac{1}{11}\right)}-\frac{2.\left(\frac{1}{6}-\frac{1}{8}+\frac{1}{10}\right)}{7.\left(\frac{1}{6}-\frac{1}{8}+\frac{1}{10}\right)}\)
\(=\frac{2}{7}-\frac{2}{7}\)
\(=0\)
\(\frac{0,4-\frac{2}{9}+\frac{2}{11}}{1,4-\frac{7}{9}+\frac{7}{11}}-\frac{\frac{1}{3}-0,25+\frac{1}{5}}{1\frac{1}{6}-0,875+0,7}=\frac{\frac{2}{5}-\frac{2}{9}+\frac{2}{11}}{\frac{7}{5}-\frac{7}{9}+\frac{7}{11}}-\frac{\frac{1}{3}-\frac{1}{4}+\frac{1}{5}}{\frac{7}{6}-\frac{7}{8}+\frac{7}{10}}\)
\(=\frac{2\left(\frac{1}{5}-\frac{1}{9}+\frac{1}{11}\right)}{7\left(\frac{1}{5}-\frac{1}{9}+\frac{1}{11}\right)}-\frac{\frac{1}{3}-\frac{1}{4}+\frac{1}{5}}{\frac{7}{2}\left(\frac{1}{3}-\frac{1}{4}+\frac{1}{5}\right)}\)
\(=\frac{2}{7}-\frac{1}{\frac{7}{2}}\)
\(=\frac{2}{7}-\frac{2}{7}=0\)
Study well ! >_<
a: 60,7+25,5-38,7
=60,7-38,7+25,5
=22+25,5
=47,5
b: \(1,3+5,2\cdot\left(-2\right)\)
=1,3-10,4
=-9,1
c: -3,7+8,1+6,7
=8,1+3
=11,1
d: \(12,65+\left(-2,35\right)=12,65-2,35=10,3\)
e: \(\left(-0,4\right)\cdot\left(-0,5\right)\cdot\left(-0,8\right)=-0,4\cdot0,5\cdot0,8=-0,2\cdot0,8=-0,16\)
f: \(3,58\cdot24,45+3,58\cdot75,55\)
\(=3,58\cdot\left(24,45+75,55\right)\)
\(=3,58\cdot100=358\)
g: 2,07+(-7,36)-(-8,97)+1,03-7,64
=2,07-7,36-7,64+8,97+1,03
=2,07-15+10
=2,07-5
=-2,93
h: 4,35-(2,67-1,65)+(3,45-6,33)
=4,35-2,67+1,65+3,45-6,33
=6+3,45-9
=3,45-3
=0,45
i: (0,36-36):(3,8+0,2)
=-35,64:4
=-8,91
j: 1,456:0,28+4,5x0,8
=5,2+3,6
=8,8
\(\left(3,5+2,9\right)-\left(3,5-0,1\right)=6,4-3,4=3\)
\(a,25.\left(7-27\right)+27.25\)
\(=25.7-27+27.25\)
\(=27.\left(25+25\right)-7\)
\(=27.50-7=135-7=128\)( ko chắc )
\(b,\left(-3\right)^2.\left(-2\right)^3\)
\(=9.\left(-8\right)=-72\)
1: =0,1-2,34=-2,24
2: =0,25+4,75-2,9=5-2,9=2,1