Tính roi rut gon:
A).3/5;3/4 2/5;3/10 9/8;3/4
B).1/4;1/2 1/8;1/6 1/5;1/10
Ai lm day du phep tinh mik tick.noi luon ra ket qua mik ko tick
Tinh nhanh bang cach rut gon:a)35nhan36 nhan14nhan3/6nhan50nhan7nhan9,b)20nhan7nhan32nhan18/5nhan21nhan8nhan2
zới ơi cái đề???? ghi lại đề đi bạn
rút gon:
A=\(\dfrac{5\sqrt{3}}{\sqrt{3-\sqrt{5}}-\sqrt{3}}-\dfrac{5\sqrt{3}}{\sqrt{3-\sqrt{5}}+\sqrt{3}}\)
B=\(\dfrac{\sqrt{2}}{2\sqrt{2}+\sqrt{3+\sqrt{5}}}\)
b) Ta có: \(B=\dfrac{\sqrt{2}}{2\sqrt{2}+\sqrt{3+\sqrt{5}}}\)
\(=\dfrac{2}{4+\sqrt{6+2\sqrt{5}}}\)
\(=\dfrac{2}{4+\sqrt{5}+1}\)
\(=\dfrac{2}{5+\sqrt{5}}=\dfrac{5-\sqrt{5}}{10}\)
de bai rut gon roi so sanh 6 phan 10 va 4 phan 5
Rút gọn phân số \(\frac{6}{10}\)là:
\(\frac{6}{10}\)= \(\frac{3}{5}\)
Vì \(\frac{3}{5}< \frac{4}{5}\)nên \(\frac{6}{10}< \frac{4}{5}\)
16 phan 24 tru 1 phan 3 rut gon roi tinh
Giup minh voi!
Rut gon roi quy dong mau cac phan so sau:
3 . 4 + 3 . 7/6 .5 + 9 va 6 . 9 - 2 . 17/63. 3 - 119
\(\frac{3.4+3}{6.5+9}=\frac{3.(4+1)}{3.10.3.3}=\frac{3.5}{3.(10+3)}=\frac{3.5}{3.13}=\frac{5}{14}\)
\(\frac{6 . 9 - 2.17}{63 . 3 - 119}=\frac{3 . ( 17 + 1 )-2 . 17}{189 - 119}\)
\(=\frac{3.17+3-2.17}{70}=\frac{\left(3-2\right).17+3}{70}\)
\(=\frac{17+3}{70}=\frac{20}{70}=\frac{2}{7}\)
Tính roi rut gon:
A).2/7:4/5 b).3/8:9/4 c).8/21:4/7
D).5/8:15/8
Ai lam day du phep tinh va cach rug gon mik tick 2 cai lan
A)2/7:4/5=2/7*5/4=10/28=5/14
b)3/8:9/4=3/8*4/9=12/72=1/6
c)8/21:4/7=8/21*7/4=56/84=2/3
D)5/8:15/8=5/8*8/15=40/120=1/3
k nha
TINH ROI RUT GON
cho phân số c/d. neu rut gon phan so c/d thi duoc phan so 2/5. neu giam tu so di 12 đv roi rut gon thi duoc phan so 4/25. tim phan so c/d.
là 20/50 đó mk chăcs thế mk đầu tien k cho mk nhé
rut gon roi tinh :(123.52/42.92.25-153.42/64.75)(48/84-4/3)
rut gon roi tinh: (84/144-225/60-169/65):(3/2-64/48-96/42)
84/144 = 7/12 225/60 = 15/4 169/65 = 13/5
64/48 = 4/3 96/42 = 16/7
( 7/12 - 15/4 - 13/5 ) : ( 3/2 - 4/3 - 16/7 )
= -173/30 : -89/42
= 1221/445
84/144 = 7/12;225/60 = 15/4;169/65 = 13/5;64/48 = 4/3;96/42 = 16/7
( 7/12 - 15/4 - 13/5 ) : ( 3/2 - 4/3 - 16/7 )
= -173/30 : -89/42
= 1221/445