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9.8.48+7.4.48+72.52+2.52.14
=48.(9.8+7.4)+52.(72+2.14)
=48.(72+28)+52.(72+28)
=48.100+52.100
=100.(48+52)
=100.100
=10000 (CHÚC BẠN HỌC TỐT NHA)
\(9.8.48+7.4.48+72.52+2.52.14\)
\(=72.48+28.48+72.52+28.52\)
\(=48.\left(72+28\right)+52.\left(72+28\right)\)
\(=48.100+52.100\)
\(=100\left(48+52\right)\)
\(=100.100=10000\)
425.7.4-170-60
= 2975.4-170-60
=11900-170-60
=11730-60
= 11670
`3/7 .4/11+3/7 .7/11-2`
`= 3/7 . ( 4/11 + 7/11)-2`
`= 3/7 . 11/11 -2`
`=3/7 . 1-2`
`= 3/7-2`
`= 3/7 - 14/7`
`=-11/7`
`3/7*4/11+3/7*7/11-2`
`=3/7*(4/11+7/11)-2`
`=3/7*1-2`
`=3/7-2`
`=3/7-14/7`
`=-11/7`
\(\dfrac{5}{7}\cdot\dfrac{4}{15}+\dfrac{5}{7}\cdot\dfrac{11}{15}+\dfrac{2}{7}\)
\(=\dfrac{5}{7}\cdot\left(\dfrac{4}{15}+\dfrac{11}{15}\right)+\dfrac{2}{7}\)
\(=\dfrac{5}{7}\cdot\left(\dfrac{4+11}{15}\right)+\dfrac{2}{7}\)
\(=\dfrac{5}{7}.\dfrac{15}{15}+\dfrac{2}{7}\)
\(=\dfrac{5}{7}\cdot1+\dfrac{2}{7}\)
\(=\dfrac{5}{7}+\dfrac{2}{7}\)
\(=\dfrac{5+2}{7}\)
\(=\dfrac{7}{7}\)
\(=1\)
= 48.(9.8+7.4)+52.(72+2.14)
=48.100+52.100
=100(48+52)
=100.100
=10000
đáp án =10000