用代入法就OK了.
(1)由②得:z=16+3y-4x ④
把④代入①③得:12y-3x=48⑤16y-21x=-4⑥
剩下的就是解二元一次方程了.这个你应该会吧.
第(2)题就是把③换成z=6-3y④,再代入①②就行了.
三元一次方程,⑴5x+6y+2z=80①4x-3y+z=16②3x-2y+6z=92③ ⑵x+2y=4①2x+3z=13②
三元一次方程,⑴5x+6y+2z=80①4x-3y+z=16②3x-2y+6z=92③ ⑵x+2y=4①2x+3z=13②
3y+z=6③
3y+z=6③
数学人气:877 ℃时间:2019-11-14 08:37:36
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