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a
x | 8 | 30 | 100 |
125 + x | 125 + 8 = 133 | 125 + 30 = 155 | 125 + 100 = 225 |
b
y | 200 | 960 | 1350 |
y - 20 | 200 - 20 = 180 | 960 - 20 = 940 | 1350 - 20 = 1330 |
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\(y\times\dfrac{5}{7}=\dfrac{9}{17}\\ y=\dfrac{9}{17}:\dfrac{5}{7}\\ y=\dfrac{63}{85}\\ x:\dfrac{8}{9}=\dfrac{7}{10}\\ x=\dfrac{7}{10}\times\dfrac{8}{9}\\ x=\dfrac{28}{45}\)
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Câu 10:
\(a,y\times7+y\times3=70\\ \Rightarrow y\times\left(7+3\right)=70\\ \Rightarrow y\times10=70\\ \Rightarrow y=7\\ b,18:y+12:y=3\\ \Rightarrow\left(18+12\right):y=3\\ \Rightarrow30:y=3\\ \Rightarrow y=10\)
câu 11:
\(a,9\times365+2\times365-365=\left(9+2-1\right)\times365=10\times365=3650\\ b,108:9-18:9=\left(108-18\right):9=90:9=10\\ c,43\times95+4\times43+43=43\times\left(95+4+1\right)=43\times100=4300\)
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a/ (y+2/9):7/4=11/7
y+2/9=11/7.7/4
y+2/9=11/4
y=11/4-2/9
y=91/36
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\(\Leftrightarrow y\times\left(\dfrac{1}{7}+\dfrac{9}{21}+\dfrac{7}{3}\right)=\dfrac{5}{3}\)
\(\Leftrightarrow y\times\dfrac{61}{21}=\dfrac{5}{3}\)
\(\Leftrightarrow y=\dfrac{5}{3}:\dfrac{61}{21}=\dfrac{35}{61}\)
y x (1/7 +9/21 +7/3)= 5/3
y x 61/21 = 5/3
y = 5/3 : 61/21
y= 35/61
Y x 7 + Y x 24 + Y x 9 = 960
Y x ( 7 + 24 + 9 ) = 960
Y x 40 = 960
Y = 960 : 40
Y = 24
Hok tốt