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a: x-4/5=3/7
=>x=3/7+4/5=43/35
b: x+3/7=4/5
=>x=4/5-3/7=13/35
c: 19/20-x=8/5-3/4
=>19/20-x=32/20-15/20=17/20
=>x=2/20=1/10
d: =>4/5*x=2/21
=>x=2/21:4/5=5/42
e: =>x:7/9=6/8
=>x=6/8*7/9=3/4*7/9=21/36=7/12
f: =>x/6=2/3-1/3=1/3
=>x=2
a: x-4/5=3/7
=>x=3/7+4/5=43/35
b: x+3/7=4/5
=>x=4/5-3/7=13/35
c: 19/20-x=8/5-3/4
=>19/20-x=32/20-15/20=17/20
=>x=2/20=1/10
d: =>4/5*x=11/21
=>x=55/84
e: =>x=6/8*7/9=42/72=7/12
f: =>x/6=2/3-1/3=1/3
=>x=2
Bài 1:
a: \(=\dfrac{21}{7}\cdot\dfrac{15}{45}\cdot\dfrac{9}{18}=3\cdot\dfrac{1}{3}\cdot\dfrac{1}{2}=\dfrac{1}{2}\)
b: \(=\dfrac{11}{33}\cdot\dfrac{24}{8\cdot12}\cdot\dfrac{27}{9}=\dfrac{24}{96}=\dfrac{1}{4}\)
a) x + 2/3 = 4/3
x = 4/3 - 2/3
x = 2/3
b( x - 5/3 = 17/18
x = 17/18 + 5/3
x = 47/18
c) 9/5 - x = 7/15
x = 9/5 - 7/15
x = 4/3
a)x+2/3=4/3
x=4/3-2/3
x=2/3
b) x-5/3=17/18
x=17/18+5/3
x=41/18
c) 9/5-x=7/15
x=9/5-7/15
x=20/15
7/9 - x . 5/18 = 7/18
x . 5/18 = 7/9 - 7/18
x . 5/18 = 7/18
x = 7/18 : 5/18
x = 7/5