Tính y : y x 27 + y x 30 + y x 43 = 210 500
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![](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) \(15\times y+85\times y=300\)
\(y\times\left(15+85\right)=300\)
\(y\times100=300\)
\(y=300\div100\)
\(y=3\)
\(a,y\times27+y\times30+y\times43=210500\)
\(\Rightarrow y\times\left(27+30+43\right)=210500\)
\(\Rightarrow y\times100=210500\)
\(\Rightarrow y=210500:100=2105\)
\(b,15\times y+85\times y=300\)
\(\Rightarrow y\times\left(15+85\right)=300\)
\(\Rightarrow y\times100=300\)
\(\Rightarrow y=300:100=3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
X x 27 + X x 30 + X x 43 = 210 500
X x ( 27 + 30 + 43 ) = 210 500
X x 100 = 210 500
x = 210 500 : 100
x = 2105
Chúc em học tốt nhé
TL:
X x 27 + X x 30 + X x 43 = 210 500
X x (27 + 30 + 43) = 210 500
X x 100 = 210 500
X = 210 500 : 100
X = 2105
HT
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\(x^2+y^2=\left(x+y\right)^2-2xy=\left(-8\right)^2-2\cdot15=34\)
Chọn D.
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,y\times27+y\times30+y\times44-y=10500\\\Rightarrow y\times\left(27+30+44-1\right)=10500\\ \Rightarrow y\times100=10500\\ \Rightarrow y=10500:100\\ \Rightarrow y=105\\ b,y\times285+115\times y=400\\ \Rightarrow y\times\left(285+115\right)=40\\ \Rightarrow y\times400=400\\ y=400:400\\ \Rightarrow y=1\)
\(a,\Rightarrow y\times\left(27+30+44-1\right)=10500\\ \Rightarrow y\times100=10500\\ \Rightarrow y=105\\ b,\Rightarrow y\times\left(285+115\right)=400\\ \Rightarrow y\times400=400\\ \Rightarrow y=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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:
\(a,9\times365+2\times365-365=\left(9+2-1\right)\times365=10\times365=3650\\ b,108:9-18:9=\left(108-18\right):9=90:9=10\\ c,43\times95+4\times43+43=43\times\left(95+4+1\right)=43\times100=4300\)
\(y\times27+y\times30+y\times43=210500\\ \Rightarrow y\times\left(27+30+43\right)=210500\\ \Rightarrow y\times100=210500\\ \Rightarrow y=210500:100\\ \Rightarrow y=2105\)