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\(42\times x=63+21\)
\(42\times x=84\)
\(x=84:42\)
\(x=2\)
k mk nha
thank you very much
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Thưa chị : a = 2 ; b = 6 ; c = 1 ; d = 9 .
Thử thay đi là bít đúng hay sai .
Xin 1 nhé .
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\(\Rightarrow\overline{8aba}+\overline{c14d}=\overline{d41c}\)
\(\Rightarrow c\le1\) => c=0 hoặc c=1
+ Nếu c=0
\(\Rightarrow\overline{8aba}+\overline{14d}=\overline{d410}\)
\(\Rightarrow d\ge8\) nhưng \(d\le9\) => d=8 hoặc d=9
- Với d=8
\(\Rightarrow\overline{8aba}+148=8410\)
\(\Rightarrow8000+\overline{aba}+148=8410\Rightarrow\overline{aba}=262\)
- Với d=9
\(\Rightarrow\overline{8aba}+149=9410\)
\(\Rightarrow8000+\overline{aba}+149=9410\Rightarrow\overline{aba}=1261\) (loại)
+ Nếu c=1
\(\Rightarrow\overline{8aba}+\overline{114d}=\overline{d411}\) => d=9
\(\Rightarrow\overline{8aba}+1149=9411\)
\(\Rightarrow8000+\overline{aba}+1149=9411\Rightarrow\overline{aba}=262\)
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=>80+a+0,1b+0,01a+10c+1+0,4+0,01d=10d+4+0,1+0,01c
=>1,01a+0,1b+10c+0,01d+81,4=10d+0,01c+4,1
=>1,01a+0,1b+9,99c-9,99d=-77,3
=>101a+10b+999c-999d=-7730
=>\(\left[{}\begin{matrix}\left(a,b,c,d\right)=\left(2;6;0;8\right)\\\left(a;b;c;d\right)=\left(2;6;1;9\right)\end{matrix}\right.\)
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ko hiểu?