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-31 30 :
| a | b | c | d | f |
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4: y , : a=16; b=-6; c=25,34; k=5; d=8,1234; p=2,45×102; x .
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| x1 | -3x2 | +x3 | =6 |
| 2x1 | -x2 | +3x3 | =9 | |
| x1 | +3x2 | -x3 | =-4 |
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