tim a b c d=? 9 11 14 18 a b c 44 d
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a. \(14-\)\(\left|x\right|\)\(=-\left(11-17\right)\)
\(14-\)\(\left|x\right|\) \(=-\left(-6\right)\)
\(14-\)\(\left|x\right|\) \(=6\)
\(\left|x\right|\) \(=14-6\)
\(\left|x\right|\) \(=8\) \(\Rightarrow x=8,x=-8\) Vậy........\(-\left(-15\right)\) \(+\left|x\right|=-\left(21-14\right)\)
\(15+\left|x\right|=-\left(-35\right)\)
\(15+\left|x\right|=35\)
\(\left|x\right|=35-15\)
\(\left|x\right|=20\)
\(\Rightarrow x=20,x=-21\)
Vậy......
a, Quy đồng mẫu chung 46.47 . So sánh : 45. 47>44.46 ----> 45/46 >44/47
b,Quy đồng mẫu chung 14.13 .So sánh :11.13 < 12.14 ---> 11/14 < 12/13
c , 24/27= 8/9 .Quy đồng mẫu chung 9.26 . So sánh : 8.26 < 25.9 ---> 24/27<25/26
d ,18/21=6/7 .Quy đồng mẫu chung 7.20. So sánh : 6.20 <19.7 ---> 18/21 < 19/20
Mình đã giải rồi . Bạn tham khảo nhé . Chúc bạn học tốt.
a: \(42=2\cdot3\cdot7;70=2\cdot5\cdot7\)
=>\(BCNN\left(42;70\right)=2\cdot3\cdot5\cdot7=210\)
=>\(BC\left(42;70\right)=B\left(210\right)=\left\{0;210;420;...\right\}\)
b: \(70=2\cdot5\cdot7;180=3^2\cdot5\cdot2^2\)
=>\(BCNN\left(70;180\right)=2^2\cdot3^2\cdot5\cdot7=1260\)
=>\(BC\left(70;180\right)=\left\{1260;2520;...\right\}\)
c: \(5=5;7=7;8=2^3\)
=>\(BCNN\left(5;7;8\right)=5\cdot7\cdot8=280\)
=>\(BC\left(5;7;8\right)=\left\{280;560;...\right\}\)
d: \(12=2^2\cdot3;18=3^2\cdot2\)
=>\(BCNN\left(12;18\right)=2^2\cdot3^2=36\)
=>\(BC\left(12;18\right)=\left\{36;72;...\right\}\)
e: \(15=3\cdot5;18=3^2\cdot2\)
=>\(BCNN\left(15;18\right)=3^2\cdot2\cdot5=90\)
=>\(BC\left(15;18\right)=\left\{90;180;...\right\}\)
f: \(84=2^2\cdot3\cdot7;108=3^3\cdot2^2\)
=>\(BCNN\left(84;108\right)=2^2\cdot3^3\cdot7=756\)
=>\(BC\left(84;108\right)=\left\{756;1512;...\right\}\)
j: \(33=3\cdot11;44=2^2\cdot11;55=5\cdot11\)
=>\(BCNN\left(33;44;55\right)=3\cdot2^2\cdot5\cdot11=660\)
=>\(BC\left(33;44;55\right)=\left\{660;1320;...\right\}\)
g: \(1=1;12=2^2\cdot3;27=3^3\)
=>\(BCNN\left(1;12;27\right)=1\cdot2^2\cdot3^3=108\)
=>\(BC\left(1;12;27\right)=\left\{108;216;...\right\}\)
n: \(5=5;9=3^2;11=11\)
=>\(BCNN\left(5;9;11\right)=5\cdot3^2\cdot11=495\)
=>\(BC\left(5;9;11\right)=\left\{495;990;...\right\}\)
a=23 b=29 c=36 d=53