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a: =>x=3/7+3/5=15/35+21/35=36/35
b: =>x/35=4/5-5/7=28/35-25/35=3/35
=>x=3
c: =>x<3/4+8/4=11/4
=>\(x\in\left\{0;1;2;3\right\}\)
d: =>5/3<x<5/6+24/6=29/6
=>\(x\in\left\{2;3;4\right\}\)
e: =>x<10/12-9/12=1/12
=>x=0
f: =>2/3<x<12/6-5/6=7/6
=>x=1
\(\dfrac{2}{3}\times\dfrac{4}{7}:\dfrac{1}{5}=\dfrac{2}{3}\times\dfrac{4}{7}\times5=\dfrac{40}{21}\)
\(x\times\dfrac{4}{5}=\dfrac{3}{5}\)
\(\Leftrightarrow x=\dfrac{3}{5}:\dfrac{4}{5}\)
\(\Leftrightarrow x=\dfrac{3}{4}\)
1,2/3.4/7:1/5=8/21:1/5=40/21
2,X x 4/5=3/5
x=3/5:4/5
x=3/4
Chúc e học tốt nkee!
a) 5. x -392 = 218
5.x =218+392
5.x = 610
x = 610 : 5
x= 122
b) [ ( 6 . x - 39 ) : 7] .4 = 12
(6.x-39 ) : 7 = 3
6.x-39= 21
6.x =21+39=60
x=10
c) 3672 : [ 119 - ( x - 6) ] =36
119-(x-6)= 3672:36=12
x-6 = 119- 12
x-6= 107
x= 107 + 6= 113
a)\(=\dfrac{3}{3}+\dfrac{4}{3}=\dfrac{7}{3}\)
b)\(=\dfrac{5}{9}\times\dfrac{3}{2}=\dfrac{15}{18}=\dfrac{5}{6}\)
d)\(=\left(\dfrac{12}{8}-\dfrac{3}{8}\right)\times2=\dfrac{9}{8}\times2=\dfrac{18}{8}=\dfrac{9}{4}\)
c)\(=\dfrac{4}{3}-\dfrac{5}{6}=\dfrac{8}{6}-\dfrac{5}{6}=\dfrac{3}{6}=\dfrac{1}{2}\)
a) 1 + 4/3 = 7/3
b) 5/9 : 2/3 = 5/6
c ) 4/3 -1/3 x 5/2
= 1 x 5/2
= 5/2
d) ( 3/2 - 3/8) : 1/2
= 9/8 : 1/2
= 9/4
e) 15/16 : 3/8 x 3/4
= 5/2 x 3/4
= 15/8
f) 7/19 x 1/3 x 7/19 x 2/3
= 7/19 x (1/3 x 2/3)
= 7/19 x 2/9
= 14/171
g) 3/5 x 8/27 x 25/3
= 3/5 x 25/3 x 8/27
= 5 x 8/27
= 40/27
h) 1/5 + 4/11 + 4/5 + 7/11
= (1/5 + 4/5) + (4/11 + 7/11)
= 1 + 1
= 2
a)
12 × 4 = 4 × 12
106 × 3 = 3 × 106
(17 × 5) × 2 = 17 × (5 × 2)
86 × 2 × 5 = 86 × (2 × 5)
b)
7 × 1 = 7
432 × 1 = 432
519 × 0 = 0
1 × 0 = 0
2 × 0 = 0
3 456 × 1 = 3 456
Đề bài yêu cầu gì vậy bạn?