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来源:学生作业帮 编辑:大师作文网作业帮 分类:综合作业 时间:2024/09/20 11:47:52
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由条件2X+Y+3Z=23,X+4Y+5Z=36,能求出X+2Y+3Z的值吗?(已知X-2Y=5,Y-2Z=1/2,)最好不要用括号里的条件,不行的话再用.
由条件2X+Y+3Z=23,X+4Y+5Z=36,能求出X+2Y+3Z的值吗?(已知X-2Y=5,Y-2Z=1/2,)最好不要用括号里的条件,不行的话再用.
由2X+Y+3Z=23得4X+2Y+6Z=46,式一;
由X+4Y+5Z=36得3X+12Y+15Z=108式二.
式一+式二=(4X+2Y+6Z)+(3X+12Y+15Z)=7X+14Y+21Z=7(X+2Y+3Z)=46+108=154;
得X+2Y+3Z=22.
由X+4Y+5Z=36得3X+12Y+15Z=108式二.
式一+式二=(4X+2Y+6Z)+(3X+12Y+15Z)=7X+14Y+21Z=7(X+2Y+3Z)=46+108=154;
得X+2Y+3Z=22.
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excel 用VBA实现只要A1,A4,A7,B2,B5,B8,C3,C6,C9,D1,D4,D7,E2,E5,E8,F
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java doudle d1,d2,d3=0.
汽车自动挡的D1,D2,D3,