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a) y x 42 + y x 57 + y = 25 400
y x ( 42 + 57 + 1 ) = 25 400
y x 100 = 25 400
y = 25 400 : 100
y = 254
b) 142 x y - 41 x y - y = 408 000
y x ( 142 - 41 - 1 ) = 408 000
y x 100 = 408 000
y = 408 000 : 100
y = 4 080
a.y*(42+57+1)=25400
y*100=25400
y=25400:100=254
b.(142-41-1)*y=408000
100*y=408000
y=408000:100=4080
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\(a,y\times27+y\times30+y\times44-y=10500\\\Rightarrow y\times\left(27+30+44-1\right)=10500\\ \Rightarrow y\times100=10500\\ \Rightarrow y=10500:100\\ \Rightarrow y=105\\ b,y\times285+115\times y=400\\ \Rightarrow y\times\left(285+115\right)=40\\ \Rightarrow y\times400=400\\ y=400:400\\ \Rightarrow y=1\)
\(a,\Rightarrow y\times\left(27+30+44-1\right)=10500\\ \Rightarrow y\times100=10500\\ \Rightarrow y=105\\ b,\Rightarrow y\times\left(285+115\right)=400\\ \Rightarrow y\times400=400\\ \Rightarrow y=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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y x 500 = 780 000
y = 780 000 : 500
y = 1560
y x 120 = 12000
y = 12000 : 120
y = 100
y : 145 = 318
y = 318 x 145
y = 46110
y : 213 = 456
y = 456 x 213
y= 97128
y x 70 = 238
y = 238 : 70
y = 3.4
y x 78 = 936
y = 936 : 78
y = 12
462 : y = 66
y = 462 : 66
y = 7
709 : y = 82
y = 709 : 82
y = 8.64634146341
y x 500 = 780 000
y = 780 000 : 500
y = 1560
y x 120 = 12000
y = 12000 : 120
y = 100
y : 145 = 318
y = 318 x 145
y = 46110
y : 213 = 456
y = 456 x 213
y= 97128
y x 70 = 238
y = 238 : 70
y = 3.4
y x 78 = 936
y = 936 : 78
y = 12
462 : y = 66
y = 462 : 66
y = 7
709 : y = 82
y = 709 : 82
y = 8.64634146341
![](https://rs.olm.vn/images/avt/0.png?1311)
y x [ 13+ 45+ 42 ] =7300
y x 100 = 7300
y = 7300 : 100 dap an day nhe
y = 73
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(y\times27+y\times30+y\times43=210500\)
\(y\times\left(27+30+43\right)=210500\)
\(y\times100=210500\)
\(y=210500\div100\)
\(y=2105\)
b) \(15\times y+85\times y=300\)
\(y\times\left(15+85\right)=300\)
\(y\times100=300\)
\(y=300\div100\)
\(y=3\)
\(a,y\times27+y\times30+y\times43=210500\)
\(\Rightarrow y\times\left(27+30+43\right)=210500\)
\(\Rightarrow y\times100=210500\)
\(\Rightarrow y=210500:100=2105\)
\(b,15\times y+85\times y=300\)
\(\Rightarrow y\times\left(15+85\right)=300\)
\(\Rightarrow y\times100=300\)
\(\Rightarrow y=300:100=3\)
\(y.27+y.42+y.70-y.19=16700\)
\(\Leftrightarrow y\left(27+42+70-19\right)=16700\)
\(\Leftrightarrow y.120=16700\)
\(\Leftrightarrow y=\dfrac{835}{6}\)
=>120y=16700
=>y=835/6