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`30 xx 25 xx 7 xx8`
`=(30 xx7) xx (25xx8)`
`=210 xx200`
`=42000`
`----`
`75 xx 8 xx 12 xx 14`
`=(75xx8) xx(12xx14)`
`=600xx168`
`=100800`
a) 8 775 : 351 + 467 x 201
= 25 + 93 867
= 93 892
b)10 000 - 8 123 + 72 306 : 351
= 1877 + 206
= 2 083
`a)=(6xx8xx5xx3)/(5xx5xx6xx3xx8)=(1)/5`
`b)=5/8xx(9/7+5/7)`
`=5/8xx2=10/8=5/4`
A,\(\dfrac{6x8x15}{25x6x24}=\dfrac{6x8x5x3}{5x5x6x3x8}=\dfrac{1}{5}\)
a: \(=\dfrac{5}{9}\cdot\dfrac{7}{4}+\dfrac{13}{9}\cdot\dfrac{7}{4}=\dfrac{7}{4}\cdot2=\dfrac{7}{2}\)
b: \(=\dfrac{14}{13}\cdot2+\dfrac{3}{13}\cdot2-2\cdot\dfrac{7}{13}=\dfrac{28}{13}+\dfrac{6}{13}-\dfrac{14}{13}=\dfrac{20}{13}\)
\(a:=\left(\dfrac{1}{4}+\dfrac{3}{4}\right)+\left(\dfrac{1}{5}+\dfrac{2}{5}\right)\\ =1+\dfrac{3}{5}=1\dfrac{3}{5}\\ b:=\left(\dfrac{2}{7}+\dfrac{1}{7}\right)+\left(\dfrac{5}{14}+\dfrac{3}{14}\right)\\ =\dfrac{3}{7}+\dfrac{8}{14}\\ =\dfrac{3}{7}+\dfrac{4}{7}=1\)
a)\(2.31.12+4.6.42+8.27.3\)
\(=24.31+24.42+24.27\)
\(=24.\left(31+42+27\right)\)
\(=24.100\)
\(=2400\)
b)\(36.28+38.82+64.69+64.41\)
\(=36.\left(28+82\right)+64.\left(69+41\right)\)
\(=36.110+64.110\)
\(=110.\left(36+64\right)\)
\(=110.100\)
\(=11000\)