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56 x 31 - 5 x 56 x4
= 56 x31 - 56 x 20
= 56 x ( 31 - 20 )
= 56 x 11
= 616
\(\dfrac{6}{36}+\dfrac{5}{6}=\dfrac{1}{6}+\dfrac{5}{6}=\dfrac{6}{6}=1\\ \dfrac{1}{4}+\dfrac{5}{30}=\dfrac{1}{4}+\dfrac{1}{6}=\dfrac{6}{24}+\dfrac{4}{24}=\dfrac{10}{24}=\dfrac{5}{12}\\ \dfrac{5}{56}+\dfrac{3}{21}=\dfrac{5}{56}+\dfrac{1}{7}=\dfrac{5}{56}+\dfrac{8}{56}=\dfrac{13}{56}\\\dfrac{12}{18}+\dfrac{12}{42}=\dfrac{2}{3}+\dfrac{2}{7}=\dfrac{14}{21}+\dfrac{6}{21}=\dfrac{20}{21} \)
6/36 + 5/6=1/6+5/6=6/6=1
1/4 + 5/30=1/4+1/6=6/24+4/24=10/24=5/12
5/56 + 3/21=5/56=1/7=5/56+8/56=13/56
12/18 + 12/42=2/3+2/7=14/21+6/21=20/21
\(310+\dfrac{1}{5}=\dfrac{1550}{5}+\dfrac{1}{5}=\dfrac{1551}{5}\)
\(\dfrac{6}{7}-\dfrac{1}{2}=\dfrac{12}{14}-\dfrac{7}{14}=\dfrac{5}{14}\)
\(\dfrac{2}{5}\times\dfrac{1}{4}\times\dfrac{2}{3}=\dfrac{4}{60}=\dfrac{1}{15}\)
a) (4895 - 2765) : 5 = 426
b) 7236 : ( 3 x 4) = 7236 : 12 = 603
c) ( 964 x 48) : 4 = 11 568
d) (371 x 56) : 7 = 2968
` 1/2 + 3/4 - 5/6 = 6/12 + 9/12 - 10/12 = 5/12`
` ( 5/6 + 3/8) xx 2/7 = ( 15/24 + 9/24) xx 2/7 = 29/24 xx 2/7 = 29/84`
` ( 7/6 - 3/4) : 3/5 = ( 14/12 - 9/12) : 3/5 = 5/12 : 3/5 = 5/12 xx 5/3 = 25/36`
` 6/7 xx 2/3 : 5/7 = 6/7 xx 2/3 xx 7/5 = 4/5`
56x4 -56x5 +56
=56x (4-5+1)
=56 x0
=0
56 x 4 + 56 x 5 +5
= 224 + 280 +5
= 504 + 5
= 509