y+36=78-10
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10 + (32 + 98) + (54 + 76) = 10 + 130 + 130 = 270
(12 + 78) + (36 + 54)+ 90 = 90 + 90 + 90 = 3 x 90 = 270
x.(\(\dfrac{1}{6}\)+\(\dfrac{1}{10}\)+\(\dfrac{1}{15}\)+\(\dfrac{1}{21}\)+\(\dfrac{1}{28}\)+\(\dfrac{1}{36}\)+\(\dfrac{1}{45}\)+\(\dfrac{1}{55}\)+\(\dfrac{1}{66}\)+\(\dfrac{1}{78}\))=\(\dfrac{220}{39}\)
x.\(\dfrac{20}{39}\)=\(\dfrac{220}{39}\)
x=\(\dfrac{220}{39}\):\(\dfrac{20}{39}\)
x=11
a: =24/15-18/15=6/15=2/5
b: =78/42-24/42=54/42=9/7
c: =30/36-12/36=18/36=1/2
d: =7/8-1/8-3/34=6/8-3/34=3/4-3/34=45/68
x.(1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/55+1/66+1/78)=220/39
x.20/39=220/39
x=220/39:20/39
x=11
32
k mink nha bạn
rùi mink k lại cho
y + 36 = 78 - 10
y + 36 = 68
y = 68 - 36
y = 32