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数学
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用加减法解方程组：{x/3+y/4=4/3.4（x+2）=3（y-4）；｛x+y/2+x-y/2=7.4（x+y）-5（x-y）=12
人气：353 ℃ 时间：2020-02-04 03:16:24
解答
先将第一个方程消去分母,化为整数4x+3y=4,再把第二个去掉括号4x+8=3y-12,然后方程一减去方程二从而消去x解出y就行了.
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