\(4\dfrac{1}{2}-3\dfrac{1}{4}=\dfrac{9}{2}-\dfrac{13}{4}=\dfrac{18}{4}-\dfrac{13}{4}=\dfrac{5}{4}\)
\(3\dfrac{1}{5}\times2\dfrac{1}{4}=\dfrac{16}{5}\times\dfrac{9}{4}=\dfrac{36}{5}\)
\(2\dfrac{1}{3}:4\dfrac{1}{5}=\dfrac{7}{3}:\dfrac{21}{5}=\dfrac{7}{3}\times\dfrac{5}{21}=\dfrac{5}{9}\)
bài 1: Tính
a} 5/12 + 1/3 x 3/5 =
B 7/5 - 4/9 : 2/5 =
C 2/5 x 1/4 : 2/5 =
bài 2: Tìm y
a 42/25 : y/5 = 5/6
b 27/y : 9/4 = 3/7
1.tinh nhanh
a=1/2+1/6+1/12+1/20+1/30+1/42
2.tim x
a)7/4-x nhân 4/3=5/19
b)(x+3/4) nhân 5/7=10/9
c)x nhân 1/2 +3/2 nhân x=4/5
toán nâng cao lớp 4
1/2 x 1/4 + 3/4
3/4 x 5/6 x 8/15
12/19 : 17/38 x 16/9
1/2 x 1/4 + 3/4
3/4 x 5/6 x 8/15
12/19 : 17/38 x 16/9
2 - x = 1/5 : 1/4
3 - x × 1/3 = 1/6
1/3 × 1/2 + 1/5 × 1/2
373737/414141 + 4545/4141
2727/4242 + 13/42 + 444444/424242
Xin giúp đỡ ạ !
8/9 + 3/18 ; 5/7 - 4/11 ; 7/9 x 3/4 ; 12/7 : 1/4
3/4 + 4/5 ; 5/7 - 3/5 ; 8/3 x 21/4 ; 7/2 : 9/4
5/7 nhân 2/3 trừ 1/4
3/4 cộng 2/3 chia 1/5
a, 1/2 - 1/3 b, 1/5 - 1/7 c, 7/9 - 2/5
d, 1/2 + 1/3 e, 2/5 + 1/4 + 1/3 g,17/42 + 3/7
h, 16/17 - 12/13
2/3+2+4/18=
4/3 - 2/5 +1/2 =
1/72 +1/56+1/42+1/30 + 1/20 +1/12=
Bài 2:
a) ( 1/4 :5 x 1/3 x 1/4 ) : ( 2/3 + 1/5 :4 )
b) ( 3/4 :5 + 1/2:3/5 ) x ( 4/5 + 1/3 x2 )
