12.5 + x + x + x +x +x=15.5 ÷ 0.5
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\(20\%\times25,5+\dfrac{1}{5}\times15,5+0,2\times59\)
\(=\dfrac{1}{5}\times25,5+\dfrac{1}{5}\times15,5+\dfrac{1}{5}\times59\)
\(=\dfrac{1}{5}\times\left(25,5+15,5+59\right)\)
\(=\dfrac{1}{5}\times100\)
\(=20\)
4.85+12.5 x X=5.85
12.5 x X = 5.85 - 4.85
12.5 x X = 1
X = 1 : 12.5
X = 0.08
4.85+12.5 x X=5.85
12.5 x X=5.85-4.85
12.5 x X=1
X=1:12.5
X=0.08
\(a,96-3\left(x+8\right)=42\\ \Rightarrow3\left(x+8\right)=54\\ \Rightarrow x+8=18\\ \Rightarrow x=10.\\ b,15.5\left(x-25\right)-225=0\\ \Rightarrow75\left(x-25\right)-225=0\\ \Rightarrow75\left(x-25\right)=225\\ \Rightarrow x-25=3\\ \Rightarrow x=28.\\ c,250:x+15=25\\ \Rightarrow250:x=10\\ \Rightarrow x=25\\ d,36:\left(x-5\right)=2^2\\ \Rightarrow36:\left(x-5\right)=4\\ \Rightarrow x-5=9\\ \Rightarrow x=14.\\ e,\left[3.\left(70-x\right)+5\right]:2=46\\ \Rightarrow3.\left(70-x\right)+5=92\\ \Rightarrow3\left(70-x\right)=87\\ \Rightarrow70-x=29\\ \Rightarrow x=41.\)
X x ( 8,75 + 1,25 ) = 20
X X 10 = 20
x = 20 : 10
x = 2
Đúng 100%
Đúng 100%
Đúng 100%
12.5 +5x= 31
5x=31-12.5
5x=18.5
x=18.5:5
x=3.7
=>12.5+x+x+x+x+x=31
=>12.5+x x 5=31
=>x x5=31:12.5
=>x x 5=2.48
=>x=2.48:5
=>x=0.496(nhớ k mik nha)