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\(a,y\times27+y\times30+y\times44-y=10500\\\Rightarrow y\times\left(27+30+44-1\right)=10500\\ \Rightarrow y\times100=10500\\ \Rightarrow y=10500:100\\ \Rightarrow y=105\\ b,y\times285+115\times y=400\\ \Rightarrow y\times\left(285+115\right)=40\\ \Rightarrow y\times400=400\\ y=400:400\\ \Rightarrow y=1\)
\(a,\Rightarrow y\times\left(27+30+44-1\right)=10500\\ \Rightarrow y\times100=10500\\ \Rightarrow y=105\\ b,\Rightarrow y\times\left(285+115\right)=400\\ \Rightarrow y\times400=400\\ \Rightarrow y=1\)
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a) (y + 5) x 2020 = 205 x 2020
(y + 5) x 2020 = 414100
y + 5 = 414100 : 2020 = 205
y = 205 - 5 = 200
a) y= 200
b) y-45600 = 1600 × 4 ×25
y-45600=160000
y= 114400
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Bài 1: Tìm y.
\(a)\dfrac{19}{20}-y=\dfrac{8}{5}-\dfrac{3}{4}\\ \dfrac{19}{20}-y=\dfrac{17}{20}\\ y=\dfrac{19}{20}-\dfrac{17}{20}\\ y=\dfrac{2}{20}\\ y=\dfrac{1}{10}\\ b)y:\dfrac{2}{3}=\dfrac{4}{9}\times3\\ y:\dfrac{2}{3}=\dfrac{4}{3}\\ y=\dfrac{4}{3}\times\dfrac{2}{3}\\ y=\dfrac{8}{9}\)
Bài 2: Giải:
Chiều cao của mảnh vườn đó là:
\(\dfrac{2}{3}-\dfrac{1}{4}=\dfrac{5}{12}\left(km\right)\)
Diện tích mảnh vườn đó là:
\(\dfrac{2}{3}\times\dfrac{5}{12}=\dfrac{5}{18}\left(km^2\right)\)
Đáp số: \(\dfrac{5}{18}km^2.\)
Bài 1:
a) \(\dfrac{19}{20}-y=\dfrac{8}{5}-\dfrac{3}{4}\)
\(\dfrac{19}{20}-y=\dfrac{17}{20}\)
\(y=\dfrac{19}{20}-\dfrac{17}{20}\)
\(y=\dfrac{2}{20}=\dfrac{1}{10}\)
b) \(y:\dfrac{2}{3}=\dfrac{4}{9}\times3\)
\(y:\dfrac{2}{3}=\dfrac{4}{3}\)
\(y=\dfrac{4}{3}\times\dfrac{2}{3}\)
\(y=\dfrac{8}{9}\)
Bài 2:
Giải:
Chiều cao của hình bình hành: \(\dfrac{2}{3}\times\dfrac{1}{4}=\dfrac{1}{6}\left(km\right)\)
Diện tích mảnh vườn: \(\dfrac{1}{6}\times\dfrac{2}{3}=\dfrac{1}{9}\left(km^2\right)\)
Đáp số: \(\dfrac{1}{9}km^2\)
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bài2:Tìm y:
a)y+253=1420 b)y-2316=902
y=1420-253 y=902+2316
y=1167 y=3218
bài3:Tính:
2754:9=306 5089:7=727 3675:5=735 2010:6=335
2754x9=24786 5089x7=35623 3675x5=18375 2010x 6=12060
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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) 15/5 < 18/5 < 20/5
3 < 18/5 < 4
Vậy x = 3; y = 4
b) 28/7 > 23/7 > 21/7
4 > 23/7 > 3
Vậy x = 4; y = 3
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Tìm y:
\(a,y+847\times2=1953-74\\ y+847\times2=1879\\ y+1694=1897\\ y=1897-1694\\ y=185\\ b,y:\left(7\times18\right)=5839+8591\\ y:126=14430\\ y=14430\times126\\ y=1818180.\)
a/ y + 847 x 2 = 1953 - 74
y + 1694 = 1879
y = 1879 - 1694
y = 185
b/y : (7 x 18) = 5839 + 8591
y : 126 = 14430
y = 14430 x 126
y = 1818180
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