解方程数学题① 0.3(y-2)=1-(x+1)/5②(0.04x+0.09)/0.2-(0.1y-0.3)/0.4=1.5呃.这是个二元一次方程组,打得不好将就着看吧.
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![解方程数学题① 0.3(y-2)=1-(x+1)/5②(0.04x+0.09)/0.2-(0.1y-0.3)/0.4=1.5呃.这是个二元一次方程组,打得不好将就着看吧.](/uploads/image/z/211453-61-3.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%E6%95%B0%E5%AD%A6%E9%A2%98%E2%91%A0+0.3%EF%BC%88y-2%29%3D1-%28x%2B1%29%2F5%E2%91%A1%280.04x%2B0.09%29%2F0.2-%280.1y-0.3%29%2F0.4%3D1.5%E5%91%83.%E8%BF%99%E6%98%AF%E4%B8%AA%E4%BA%8C%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%BB%84%2C%E6%89%93%E5%BE%97%E4%B8%8D%E5%A5%BD%E5%B0%86%E5%B0%B1%E7%9D%80%E7%9C%8B%E5%90%A7.)
解方程数学题① 0.3(y-2)=1-(x+1)/5②(0.04x+0.09)/0.2-(0.1y-0.3)/0.4=1.5呃.这是个二元一次方程组,打得不好将就着看吧.
解方程数学题
① 0.3(y-2)=1-(x+1)/5
②(0.04x+0.09)/0.2-(0.1y-0.3)/0.4=1.5
呃.这是个二元一次方程组,打得不好将就着看吧.
解方程数学题① 0.3(y-2)=1-(x+1)/5②(0.04x+0.09)/0.2-(0.1y-0.3)/0.4=1.5呃.这是个二元一次方程组,打得不好将就着看吧.
1、0.3(y-2)=1-(x+1)÷5
0.3y-0.6=1-x÷5+0.2
0.3y=1+0.6-x÷5+0.2
0.3y=1.6+0.2-x÷5
0.3y=1.8-x÷5
y=1.8-x÷5÷0.3
y=1.8-x÷1.5
y-1.8=-x÷1.5
y+x=1.8÷1.5
y=2
x=4
0.3y-0..6=1-0.2x-0.2
0.02x+0.45-0.25y+0.75=1.5
y=2 x=4
0.3y-0.6=0.8-0.2x
0.2x+0.45-0.25y+0.75=1.5
0.2x+0.3y-1.4=0
0.2x-0.25y-0.3=0
0.55y=1.1 y=2
代入 x=4
1-0.3(y-2)=x+1/5
两边同乘以5
5-1.5(y-2)=5x+1
5-1.5y+3=5x+1
5x+1.5y-7=0
从1解出x或y然后代入2即可
1、0.3(y-2)=1-(x+1)÷5
0.3y-0.6=1-x÷5+0.2
0.3y=1+0.6-x÷5+0.2
0.3y=1.6+0.2-x÷5
0.3y=1.8-x÷5
y=1.8-x÷5÷0.3
...
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1、0.3(y-2)=1-(x+1)÷5
0.3y-0.6=1-x÷5+0.2
0.3y=1+0.6-x÷5+0.2
0.3y=1.6+0.2-x÷5
0.3y=1.8-x÷5
y=1.8-x÷5÷0.3
y=1.8-x÷1.5
y-1.8=-x÷1.5
y+x=1.8÷1.5
y=2
x=4
收起
原方程组化为2x+3y=14,4x-5y=6.解这个 方程组得x=4,y=2