a) 1/4-1/6+1/12=
b) 3/8-(3/4-1/2)=
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1.
a, Ta có 28=14⇒14+56=1312(Bn tự quy đồng lên nhé !)
b,Ta có1216=34⇒18+34=78(Bn tự quy đồng lên nhé !)
c,Ta có636=16⇒14+16=512(Bn tự quy đồng lên nhé !)
d,Ta có1218=23⇒23+14=1112(Bn tự quy đồng lên nhé !)
7.Phần này mk chỉ cho đáp án thuia.67 ;
b,420=15 ;
c,615 ;
d,129
a) ( 1 - 1/2 ) x ( 1 - 1/3 ) x ( 1 - 1/4 ) x ( 1 - 1/5 ) x ( 1 - 1/6 )
= 1/2 x 2/3 x 3/4 x 4/5 x 5/6
= \(\frac{1.2.3.4.5}{2.3.4.5.6}\)
= 1/6
a) 2/8+5/15+9/12+4/6
=1/4+1/3+3/4+2/3
=(1/4+3/4)+(1/3+2/3)
=1 + 1
=2
b) 1/2+1/4+1/8+1/16
=8/16+4/16+2/16+1/16
=15
c) 1/3-1/4+2/3
=4/12-3/12+8/12
=3/4
d) 1/2-1/3+1/4-1/6
=(1/2-1/4) + (1/3-1/6)
=(2/4-1/4)+(2/6-1/6)
=1/4+1/6
=6/24+4/24
=5/12
k cho mình nha
a) \(\dfrac{5}{6};\dfrac{2}{3};\dfrac{1}{2}\)
b) \(2\dfrac{7}{8};1\dfrac{4}{5};1\dfrac{3}{4}\)
c) \(\dfrac{11}{12};\dfrac{5}{6};\dfrac{3}{8}\)
a)=(9/24+-18/24+14/24):5/6+1/2
=5/24:5/6+1/2
=1/4+1/2
=3/4
b)=5/4-(-1/20)
=5/4+1/20
=4/5
a, \(\dfrac{1}{4}\) - \(\dfrac{1}{6}\) + \(\dfrac{1}{12}\)
= \(\dfrac{3}{12}\) - \(\dfrac{2}{12}\) + \(\dfrac{1}{12}\)
= \(\dfrac{2}{12}\)
= \(\dfrac{1}{6}\)
b, \(\dfrac{3}{8}\) - ( \(\dfrac{3}{4}\) - \(\dfrac{1}{2}\))
= \(\dfrac{6}{16}\) - \(\dfrac{12}{16}\) + \(\dfrac{8}{16}\)
= \(\dfrac{2}{16}\)
= \(\dfrac{1}{8}\)
a) 1/4 - 1/6 = 1/12
= 3/12 - 2/12 + 1/12
=1/12 + 1/12
= 2/12
= 1/ 6
B) 3/8 - ( 3/4 - 1/2)
= 6/16 - (12 / 16 -8/16)
= 6/16 - 4 /16
= 2/16
=1/8