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A.98 456..>...89 456 100 000.>...97 999 234 * 100...=.23 400 75 000 : 1000 ..=....75 B. 102 345....<.120 345 999 999..<.. 1 000 000 148 * 1000..=...148 000 380 000 : 1000 ..>.....308
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\(y\times7=5,6\%\)
\(\Leftrightarrow y\times7=\dfrac{5,6}{100}\)
\(\Leftrightarrow y=\dfrac{5,6}{100}:7=\dfrac{1}{125}\)
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123+234+345+456+567+678+789
=(123+567)+(234+456)+(345+789)+678
=690+690+1134+678
=1380+1134+678
=2514+678
=3192
tick nha
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4 5 6 + 2 3 4 x 1 1 2 = 29 6 + 11 4 x 3 2 = 29 6 + 33 8 = 116 24 + 99 24 = 215 24
Đáp án cần chọn là A
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123 + 234 + 456 + 543 - {19 + 1+ 20}
= (123 + 234 + 456 + 543) - (19+1+ 20)
= 1356 - 40
=1316
\(\left(123+234+543\right)+\left(456+20+20\right)\)
\(=900+496=1396\)
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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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y:456=43798-234
y:456=43564
y=43564x456
y=19865184
\(y:456=43789-234\)
\(y:456=43555\)
\(y=43555\times456\)
\(y=19861080\)