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\(\Rightarrow y\times\left(3,2+6,8\right)=26,68\\ \Rightarrow y\times10=26,68\\ \Rightarrow y=26,68:10\\ \Rightarrow y=2,668\)
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a) X x 7 = 5,6%
X = 5,6% : 7
X = 0,008
b) 42% : X = 6
X = 42% : 6
X = 0,07
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\(0,336\times X:0,35=0,6\)
\(\Rightarrow0,336\times X=0,6\times0,35\)
\(\Rightarrow0,336\times X=0,21\)
\(\Rightarrow X=0,336:0,21\)
\(\Rightarrow X=1,6\)
\(5,6\times4+5,6\times3+5,6\times2+5,6\)
\(=5,6\times4+5,6\times3+5,6\times2+5,6\times1\)
\(=5,6\times\left(4+3+2+1\right)\)
\(=5,6\times10=56\)
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219,1 + y:y < y \(\times\) 2 + y \(\times\) 4 - y < 230,2 - y + y
219,1 + 1 < y \(\times\) 2 + y \(\times\) 4 - y \(\times\) 1 < 230,2 - ( y - y)
210,1 < y \(\times\) ( 2 + 4 - 1) < 230,2
210,1 < y \(\times\) 5 < 230,2
210,1 : 5 < y < 230,2: 5
42,02 < y < 46,04
\(y\times7=5,6\%\)
\(\Leftrightarrow y\times7=\dfrac{5,6}{100}\)
\(\Leftrightarrow y=\dfrac{5,6}{100}:7=\dfrac{1}{125}\)
mình cảm ơn bạn