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a)
7-x-25-7=-25
-x-25=-25
-x=0
x=0
b)
(3x-24).73=2.74
3x-24 = 2.74 : 73 = 2.74-3=2.7=14
3x-16=14
3x=14+16=30
x=30:3=10
2016 : \(\left[25-\left(3x+2\right)\right]=3^7\)
<=> 25 - (3x + 2) = 2016 : 2187
<=> 25 - 3x - 2 = \(\dfrac{224}{243}\)
<=> -3x = \(\dfrac{224}{243}\) + 2 - 25
<=> -3x = \(\dfrac{-5365}{243}\)
<=> x = 7,359396433 \(\approx\) 7,4
\(\Leftrightarrow3x-16=2.7^4+7^3=5145\Leftrightarrow3x=5161\Leftrightarrow x=\dfrac{5161}{3}\)
\(\left(3x-2^4\right)-7^3=2.7^4\\ \Leftrightarrow\left(3x-16\right)=2.7^4+7^3\\ \Leftrightarrow3x-16=5145\\ \Leftrightarrow3x=5145+16=5161\\ \Leftrightarrow x=\dfrac{5161}{3}\)
\(\left(3x-2^4\right).7^3=2.7^4\\ \Leftrightarrow3x-16=2.7^4:7^3\\ \Leftrightarrow3x=14+16\\ \Leftrightarrow3x=30\\ \Leftrightarrow x=10\)
Vậy...
\(\left(2x-2^4\right).7^3=2.7^4\)
\(\Leftrightarrow\left(2x-2^4\right)=2.7^4:7^3\)
\(\Leftrightarrow2x-2^4=2.7\)
\(\Leftrightarrow2x-16=14\)
\(\Leftrightarrow2x=30\)
\(\Leftrightarrow x=15\)
Vậy ..
\(\left(3x-2^4\right).7^3=2.7^4\)
\(\left(3x-2^4\right)=2.7^4\div7^3\)
\(3x-2^4=2.7\)
\(3x-2^4=14\)
\(3x=14+2^4\)
\(3x=30\)
`=>` \(x=30\div3\)
`=> x=10`
71.72.73....72016
=71+2+3+...+2016
=7(2016+1).2016:2
=72017.2016:2
=72033136
=(72)1016568
=491016568
=(492)508284
=(...1)508284
=...1 :5 (dư 1)
Tìm x hả bạn
\(2016:\left[25-\left(3x+2\right)\right]=3^2.7\)
\(2016:\left[25-\left(3x+2\right)\right]=9.7=63\)
\(25-\left(3x+2\right)=2016:63\)
\(25-\left(3x+2\right)=32\)
\(3x+2=25-32\)
\(3x+2=-7\)
\(3x=-7-2\)
\(3x=-9\)
\(x=\left(-9\right):3\)
\(x=-3\)
Vậy...
\(#NqHahh\)