作业帮若3x+7y+z=315,4x+10y+z=420,则x+y+z=________________.
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若3x+7y+z=315,4x+10y+z=420,则x+y+z=________________.
若3x+7y+z=315,4x+10y+z=420,则x+y+z=________________.
若3x+7y+z=315,4x+10y+z=420,则x+y+z=________________.
3X+7Y+Z=315 (1)
4X+10Y+Z=420 (2)
(2)-(1):X+3Y=105,所以:X=105-3Y.(3)
把(3)代入(1)中:
3(105-3Y)+7Y+Z=315,化简:-2Y+Z=0,则:
X+Y+Z=105-3Y+Y+Z=105-2Y+Z=105
若3x+7y+z=315,4x+10y+z=420,则x+y+z=105。
已知3x+7y+z=315和4x+10y+z=420,求x+y+z
若3x+7y+z=5,4x+10y+z=3,则x+y+z=?
谢了3x+7y+z=315 4x+10y+z=4203x+7y+z=3154x+10y+z=420
若3x+7y+z=315,4x+10y+z=420,则x+y+z=________________.
9、若3x+7y+z=315,4x+10y+z=420,则x+y+z=________________.
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