x*3/7=2/5
=>x=2/5:3/7=2/5*7/3=14/15
3/7:x=1/2
=>x=3/7:1/2=6/7
7/5-x=2/3
=>x=7/5-2/3=21/15-10/15=11/15
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a ( 3/4 + 1/2 ) x 5/7 =
Tính bằng hai cách:
Cách 1 :
Cách 2 :
b) 5/7 x 13/21 + 2/7 x 13/ 21=
Tính bằng hai cách :
Cách 1 :
Cách 2 :
c) Tính 7/5 + 4/3 + 7/5 + 4/3 bằng hai cách :
Cách 1 : 7/5 + 4/3 + 7/5 + 4/3 = 7/5 x 2 + 4/3 x 2 =
Cách 2 : 7/5 + 4/3 + 7/5 + 4/3 = ( 7/5 + 4/3) x 2 =
Bài 1 : Tính bằng hai cách
a) ( 6/11 + 5/11 ) x 3/7 =
b) 3/5 x 7/9 - 3/5 x 2/9 =
c) ( 6/7 - 4/7 ) : 2/5 =
d) 8/15 : 2/11 + 7/15 : 2/11 =
Bài 2 : Tính
a) 2 x 3 x4/3 x 4 x 5 =
b) 2/3 x 3/4 x 4/5 : 1/5 =
c) 1 x 2 x 3 x 4 / 5 x 6 x 7 x8 =
d) 2/5 x 3/4 x 5/6 : 3/4 =
Tìm X:
a).X:1/2=3/4
b).X-1/2=4/5
c).X+2/3=7/5
d).X x 5/4=2/7
e).7/3-x=4/7
f).5/9:x=4/13
g).1/2+x=3/4
h).1/2-x=3/4
i).2/3x X =7/5
k).X:5/4=2/7
l).7/3-x=4/7x14/8
2NG ĐẦU ĐÙNG THÌ MK SẼ TICK NKA
1) 1/3 x 1/2 x 3/7 2) 5/4 x 1/3 + 1/7 3) 8 x ( 8/9-2/3 ) 4) 5/6 x 48/20 x 1/2 5) ( 2/5 + 3/4 ) x 8 6) 10 x ( 1/2-1/5 )
tìm X biết :
a.2/3 : 5/7 : x/9 = 2/7 : 3/5 :10/9
b.3/5 : 7/x : 3/4 = 12/105
c.x : 1/2 = 2/3 x 4/5 x 3/4 x 15/8
Tính:
a) 2/3 + 52 - 3/4
b) 2/5 x 1/2 : 1/3
c) 1/2 x 1/3 + 1/4
d) 2/7 : 2/3 - 1/7
e) 7/9 x 3/14 : 5/8
g) 5/12 - 7/32 : 21/16
x/7 - 1/2 = 3 - 5/7
(x + 2/3) -1/5 = 7/15
Tính bằng cách thuận tiên nhất:1):(3/4 x 5/97 + 1/9 x 13/47) x (1/5 - 7/25 x 5/7)2): 8/17 x 4/15 + 8/17 x 22/15 - 8/15 x 9/173): 2021/2 x 1/3 + 4042/4 x 1/5 + 6063/3 x 22/154); 4/7 x 2/13 + 8/13 :7/4 + 4/7 : 13/2 + 4/7 x 1/135): 2022 x 2021 - 1/ 2021 + 2022 x 20206): 18 x 123 + 9 x 4567 x 2 + 3 x 5310 x 6 / (2 + 4 + 6 + 8 + ...+20 + 22) + 487): A 2021 x 2021 x 202020 - 2020 x 2020 x 20212021 / 2020 x 201920...
Đọc tiếp
Tính bằng cách thuận tiên nhất:
1):(3/4 x 5/97 + 1/9 x 13/47) x (1/5 - 7/25 x 5/7)
2): 8/17 x 4/15 + 8/17 x 22/15 - 8/15 x 9/17
3): 2021/2 x 1/3 + 4042/4 x 1/5 + 6063/3 x 22/15
4); 4/7 x 2/13 + 8/13 :7/4 + 4/7 : 13/2 + 4/7 x 1/13
5): 2022 x 2021 - 1/ 2021 + 2022 x 2020
6): 18 x 123 + 9 x 4567 x 2 + 3 x 5310 x 6 / (2 + 4 + 6 + 8 + ...+20 + 22) + 48
7): A= 2021 x 2021 x 202020 - 2020 x 2020 x 20212021 / 2020 x 20192019
Bài 1. Tính bằng cách thuận tiện nhất:
a)(1/3+1/5)x1/4 b)5/3 x 4/5 x 6/7 c) 2/5 x 3/7 + 2/5 x 4/7