解方程组x=1.2-0.2y 4x+2y=7.2x,y各等于几?详解,理由.
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解方程组x=1.2-0.2y4x+2y=7.2x,y各等于几?详解,理由.解方程组x=1.2-0.2y4x+2y=7.2x,y各等于几?详解,理由.解方程组x=1.2-0.2y4x+2y=7.2x,y
解方程组x=1.2-0.2y 4x+2y=7.2x,y各等于几?详解,理由.
解方程组x=1.2-0.2y 4x+2y=7.2
x,y各等于几?详解,理由.
解方程组x=1.2-0.2y 4x+2y=7.2x,y各等于几?详解,理由.
x=1.2-0.2y 代入4x+2y=7.2
4(1.2-0.2y)+2y=7.2
4.8-0.8y+2y=7.2
1.2y=2.4
y=2
x=1.2-0.2y=0.8
将x=1.2-0.2y代入第二个式子中,得1.2y+4.8=7.2,解得y=2,x=0.8
y=2,x=0.8
解方程组x=1.2-0.2y 4x+2y=7.2x,y各等于几?详解,理由.
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