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a: =>x+50=9/4
hay x=-47,75
b: =>4x-16=(4000+12)x2=8024
=>4x=8040
hay x=2010
a) \(\left(x+50\right):4=3^2\)
\(x+50:4=9\)
\(x+50=4.9\)
\(x+50=36\)
\(x=36-50\)
\(x=-14\)
b) \(\left(4x-16\right):2-\left(-12\right)=4000\)
\(4x-16:2-12.2=4000\)
\(4x-16:2-24=4000\)
\(4x-\left(16+24\right);2=4000\)
\(4x-30:2=4000\)
\(4x-30=4000.2\)
\(4x-30=8000\)
Câu này đáp án là 3 phải không mọi người, sao nhấn vào lại sai
a) \(58+7x=100\)
\(=>7x=100-58\)
\(=>7x=42\)
\(=>x=42:7\)
\(=>x=6\)
b) \(3x-7=28\)
\(=>3x=28+7\)
\(=>3x=35\)
\(=>x=35:3\)
\(=>x=\dfrac{35}{3}\)
c) \(x-56:4=16\)
\(=>x-14=16\)
\(=>x=16+14\)
\(=>x=30\)
d) \(101+\left(36-4x\right)=105\)
\(=>36-4x=105-101\)
\(=>36-4x=4\)
\(=>4x=36-4\)
\(=>4x=32\)
\(=>x=32:4\)
\(=>x=8\)
e) \(\left(x-12\right):12=12\)
\(=>x-12=12.12\)
\(=>x-12=144\)
\(=>x=144-12\)
\(=>x=132\)
f) \(\left(3x-2^4\right).7^3=2.7^4\)
\(=>3x-2^4=2.7^4:7^3\)
\(=>3x-16=2.7=14\)
\(=>3x=14+16\)
\(=>3x=30\)
\(=>x=30:3\)
\(=>x=10\)
i) \(\left(10+2x\right).4^{2011}=4^{2013}\)
\(=>10+2x=4^{2013}:4^{2011}\)
\(=>10+2x=4^2=16\)
\(=>2x=16-10\)
\(=>2x=6\)
\(=>x=6:2\)
\(=>x=3\)
\(#WendyDang\)
Ta có:\(\left(4x-16\right).4+12=28\)
\(\Rightarrow\left(4x-16\right).4=28-12=16\)
\(\Rightarrow4x-16=16:4=4\)
\(\Rightarrow4x=4+16=20\)
\(\Rightarrow x=20:4=5\)
\(\left(4x-16\right)\cdot4+12=28\)
\(\left(4x-16\right)\cdot4=28-12\)
\(\left(4x-16\right)\cdot4=16\)
\(4x-16=16\div4\)
\(4x-16=4\)
\(4x=4+16\)
\(4x=20\)
\(\Rightarrow x=5\)