Tính nhanh:
11/17 x (38/45 x 17/11)
Tính nhanh:
$\dfrac{11}{17}$ x ( $\dfrac{38}{45}$ x $\dfrac{17}{11}$
Tính nhanh:
\(\dfrac{17}{13}:\dfrac{51}{26}=\dfrac{17}{13}x\dfrac{26}{51}=\dfrac{17x13x2}{13x17x3}=\dfrac{2}{3}\)
\(\dfrac{33}{38}:\dfrac{11}{19}\)=?
\(\dfrac{33}{38}:\dfrac{11}{19}=\dfrac{33\times19}{38\times11}=\dfrac{3\times1}{2\times1}=\dfrac{3}{2}\)
tính nhanh: \(\frac{38}{48}-\left(\frac{8}{45}-\frac{17}{51}-\frac{3}{11}\right)\)
\(\frac{38}{48}-\left(\frac{8}{45}-\frac{17}{51}-\frac{3}{11}\right)\)
\(=\frac{38}{48}-\left(-\frac{212}{495}\right)\)
\(=\frac{4831}{3960}\)
1. Tìm X để có các phân số bằng nhau:
a, 2/3 = 12/ x
b, 14/56 =1/x
c,24/36 = x/12
2. tính nhanh
38/11 + 4/17 - 5/11 - 3/17
3 tính
2/7 x = 2/3
2/5 : x = 1/3
Giúp tui nhanh đc k
1.
a, 2/3=12/x
12/18=12/x
=>x=18
Vậy x=18
b, 14/56=1/x
1/4=1/x
=>x=4
Vậy x=4
c, 24/36=x/12
2/3=x/12
8/12=x/12
=>x=8
Vậy x =8
2
38/11+4/17-5/11-3/17
=(38/11-5/11)+(4/17-3/17)
=33/11+1/17
=3+1/17
=51/17+1/17
=52/17
3.
2/7 x =2/3
x=2/3:2/7
x=2/3x7/2
x=7/3
Vậy x=7/3
2/5:x=1/3
x=2/5:1/3
x=2/5x3
x=6/5
Vậy x= 6/5
K cho mình nha bạn !!!!!!!!!!!!^^
Tớ không hiểu. Cậu giải đi
38/45-(8/45-17/51-3/11)
38/45 - ( 8/45 - 17/51-3/11)
giúp mik với ạ
\(\dfrac{38}{45}-\left(\dfrac{8}{45}-\dfrac{17}{51}-\dfrac{3}{11}\right)\)
\(=\dfrac{38}{45}-\dfrac{8}{45}+\dfrac{17}{51}+\dfrac{3}{11}\)
\(=\left(\dfrac{38}{45}-\dfrac{8}{45}\right)+\dfrac{1}{3}+\dfrac{3}{11}\)
\(=\dfrac{2}{3}+\dfrac{1}{3}+\dfrac{3}{11}\)
\(=\left(\dfrac{2}{3}+\dfrac{1}{3}\right)+\dfrac{3}{11}\)
\(=1+\dfrac{3}{11}\)
\(=\dfrac{11}{11}+\dfrac{3}{11}\)
\(=\dfrac{14}{11}\)
#Sahara |
1 tính nhẩm tính nhanh
a 45 + 98
b 2605 - 95
c 28 . 73 + 28
d [ 1700 - 340 + 17 ] : 17
2 Tim x , biet
a 7 [ x -3 ] - 6 = 1
b [ x + 5 ] . 2 : 11 = 6
a =143
b = 2510
c 28 x 73 = 2044
cái câu c tính nhẩm chết liền
d [ 1700 - 340 +17 ] : 17 = 81
2 . Tìm x
a 7 . [ x - 3 ] - 6 = 1
7 . [ x - 3 ] = 1+6
7 . [ x - 3 ] = 7
x - 3 = 7 : 7
x - 3 =1
x=3+1=4
b
[x+5] .2:11=6
[x+5] x 2 = 6 x 11
[ x + 5 ] x 2 = 66
x+2=66:2
x+2=33
x=33-2=31
Bài 1
a, \(45+98=143\)
b, \(2605-95=2510\)
c,\(28.73+28\)
\(=28.\left(73+1\right)\)
\(=28.74\)
\(=2072\)
d,\(\left[1700-340+17\right]:17\)
\(=1700:17-340:17+17:17\)
\(=100-20+1\)
\(=81\)
Bài 2
a, \(7.\left(x-3\right)-6=1\)
\(\Leftrightarrow7.\left(x-3\right)=7\)
\(\Leftrightarrow x-3=1\)
\(\Leftrightarrow x=4\)
b, \(\left(x+2\right).2:11=6\)
\(\Leftrightarrow\left(x+2\right).2=66\)
\(\Leftrightarrow x+2=33\)
\(\Leftrightarrow x=31\)
Tính bằng cách thuận tiện nhất:
6/15 x 45/12 x 11/34 x 17/33
Ta có:
=\(\dfrac{6x45x11x17}{15x12x34x33}\)
= \(\dfrac{6x15x3x11x17}{15x6x2x17x2x11x3}\)
= \(\dfrac{1}{2x2}\)
=\(\dfrac{1}{4}\)
Những chữ x ở trên là dấu nhân nhé
38/11 + 4/17 - 5/11 - 3/17
giải giúp mik nhanh nhé mik đang cần gấp ^^
\(\frac{38}{11}+\frac{4}{17}-\frac{5}{11}-\frac{3}{17}\)
\(=\frac{38}{11}-\frac{5}{11}+\frac{4}{17}-\frac{3}{17}\)
\(=\frac{33}{11}+\frac{1}{17}\)
\(=3+\frac{1}{17}\)
\(=\frac{52}{17}\)
38/11+4/17-5/11-3/17
=(38/11-5/11)+(4/17-3/17)
=3+1/17
=51/17+1/17=52/17
\(\left(\frac{38}{11}-\frac{5}{11}\right)+\left(\frac{4}{17}-\frac{3}{17}\right)=\frac{33}{11}+\frac{1}{17}=3+\frac{1}{17}=\frac{52}{17}\)