5 x 6 : a = 5. tìm a
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a) x = 4/5 : 5/7
x = 28/25
b) 3/5 : x = 5/6 - 2/5
3/5 : x = 13/30
x = 3/5 : 13/30
x = 18/13
`#3107.101107`
a)
\(x\times\dfrac{4}{5}\div2=\dfrac{6}{7}\\x\times\dfrac{2}{5}=\dfrac{6}{7}\\ x=\dfrac{6}{7}\div\dfrac{2}{5}\\ x=\dfrac{15}{7} \)
Vậy, \(x=\dfrac{15}{7}\)
b)
\(\dfrac{6}{5}\div x\div\dfrac{5}{4}=\dfrac{10}{15}\\ \dfrac{24}{25}\div x=\dfrac{10}{15}\\ x=\dfrac{24}{15}\div\dfrac{10}{15}\\ x=\dfrac{36}{25}\)
Vậy, \(x=\dfrac{36}{25}.\)
` 5/8 -x = 7/6`
`=> x= 5/8 -7/6`
`=>x= 30/48 - 56/48`
`=>x=-26/48`
`=>x=-13/24`
__
`1/6 + 1/5 :x =-7 /18`
`=> 1/5 :x =-7 /18 -1/6`
`=> 1/5 :x =-7 /18- 3/18`
`=> 1/5 :x =-5/9`
`=>x= 1/5 : (-5/9)`
`=>x= 1/5 xx (-9/5)`
`=>x=-9/25`
a: x=5/8-7/6=15/24-28/24=-13/24
b: =>1/5:x=-7/18-1/6=-7/18-3/18=-10/18=-5/9
=>x=-1/5:5/9=-9/25
\(a,A=2\sqrt{x+5}-2\sqrt{x+5}+3\sqrt{x+5}=2\sqrt{x+5}\\ b,A=6\\ \Leftrightarrow\sqrt{x+5}=2\Leftrightarrow x=-1\left(tm\right)\)
Lời giải:
a. $(x-3)(y+1)=5=1.5=5.1=(-1)(-5)=(-5)(-1)$
Vì $x-3, y+1$ cũng là số nguyên nên ta có bảng sau:
b.
$A=21+5+(5^2+5^3)+(5^4+5^5)+....+(5^{98}+5^{99})$
$=26+5^2(1+5)+5^4(1+5)+....+5^{98}(1+5)$
$=2+24+(1+5)(5^2+5^4+...+5^{98}$
$=2+24+6(5^2+5^4+....+5^{98})=2+6(4+5^2+5^4+...+5^{98})$
$\Rightarrow A$ chia $6$ dư $2$.
`x xx4/5 :2=6/7`
`x xx 4/5xx1/2=6/7`
`x xx2/5=6/7`
`x=6/7:2/5`
`x=6/7xx5/2`
`x=15/7`
b)
`6/5:x:5/4=10/15`
`6/5:x xx4/5=2/3`
`6/5:x=2/3:4/5`
`6/5:x=2/3xx5/4`
`6/5:x=5/6`
`x=6/5:5/6`
`x=6/5xx6/5`
`x=36/25`
a) x × 4/5 : 2 = 6/7
x × 4/5 = 6/7 × 2
x × 4/5 = 12/7
x = 12/7 : 4/5
x = 15/7
b) 6/5 : x : 5/4 = 10/15
6/5 : x : 5/4 = 2/3
6/5 : x = 2/3 × 5/4
6/5 : x = 5/6
x = 6/5 : 5/6
x = 36/25
a=6 nha bn
\(5x6:a=5\)
\(30:a=5\)
\(a=30:5\)
\(a=6\)
Vậy a=6
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