若x+y+4z=10,4x+4y+z=15,则x+y+z的值是
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若x+y+4z=10,4x+4y+z=15,则x+y+z的值是若x+y+4z=10,4x+4y+z=15,则x+y+z的值是若x+y+4z=10,4x+4y+z=15,则x+y+z的值是x+y+4z=
若x+y+4z=10,4x+4y+z=15,则x+y+z的值是
若x+y+4z=10,4x+4y+z=15,则x+y+z的值是
若x+y+4z=10,4x+4y+z=15,则x+y+z的值是
x+y+4z=10
4x+4y+z=15
两式相加
5x+5y+5z=25
5(x+y+z)=25
x+y+z=5
不懂的欢迎追问~
5x+5y+5z=25
x+y+z=3
x+y+4z=10,4x+4y+z=15
相加得
5(x+y+z)=25
x+y+z=5
.
x+y+z
=(x+y+4z+4x+4y+z)÷5
=(10+15)÷5
=5
把两个式子相加,得到5X+5Y+5Z=25
等式两边同时除以5,就得到X+Y+Z=5
x+y+4z=10 扩大四倍4x+4y+16z=40 再减去4x+4y+z=15,Z=5/3. 4x+4y+z=15的两边同时加上3个z 为4x+4y+4z=15+5=20 化简为x+y+z=5
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