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用代入法解方程组使用代入法化简,最好的变形是( )
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教案备课库《7.2二元一次方程组的解法(一)—代入消元法课后作业》真题及答案
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用代入法解方程组:
用代入消元法解方程组
解方程组1代入法
用代入法解方程组时将方程①代入②中所得的方程正确的是.
3x+4y-3=8
3x+4x-6=8
3x-2x-3=8
3x+2x-6=8
用代入法解方程组.
用代入消元法解方程组
用代入法解方程组较简便的解法步骤是先把方程变形为再代入方程①求得y的值然后再求x的值.
用代入法解方程组正确的解法是
先将①变形为
,再代入②
先将①变形为
,再代入②
先将②变形为
,再代入①
先将②变形为
,再代入①
解方程组①②③④比较适宜的方法是
①②用代入法,③④用加减法
②③用代入法,①④用加减法
①③用代入法,②④用加减法
②④用代入法,①③用加减法
用代入法解方程组
用代入法解方程组:
用代入法解方程组较简便的步骤是先把方程________变形为__________再代入方程_____
用代入法解方程组能使代入后化简比较容易的变形是
由①得x=
由①得y=
由②得x=
由②得y=2x﹣5
用代入法解方程组使得代入后化简比较容易的变形是
由①,得x=
由①,得y=
由②,得x=
由②,得y=5x-3
用代入消元法解方程组
解方程组代入法及加减法两种方法解方程
用代入法解方程组时最简单的方法是
先将①变形为
,再代入②
先将①变形为
,再代入②
先将①变形为5y=2x,再代入②
先将①变形为
,再代入②
用代入消元法解方程组
用代入消元法解方程组
用代入法解方程组的正确解法是
先将①变形为x=
,再代入②
先将①变形为y=
,再代入②
先将②变形为x=
y-1,再代入①
先将②变形为y=9(4x+1),再代入①
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