用代入消元法求下列方程组的解:x=3y,y=2x,(1)(2)2x+6y=60;3x+2y=14;y=x+3,(3)(4)7x+5y=9;\(2x-y=3.3x+y-1=0. ;\(3x+2y=14x-y=3;.,(5)(6)20x+4y=18;(7)\(x+y=102x+y=16. 3s+t=5,(8);s+2t=15;(9)\(3x+2y=22x-6y=33. ,(10);\(y-x=3.2x+4y=9...
4WE6C7X/HG24N9K44WE6EA7X/HG24N9K44WE6Y7X/HG24N9K44WE6D7X/HG24N9K44WE6E7X/HG24N9K44WE6J6X/HG24N9K4 4WE6J6X/EG24N9K44WE6E6X/EG24N9K44WE6L6X/EG24N9K44WE6U6X/EG24N9K44WE6M6X/EG24N9K44WE6H6X/EG24N9K44WE6G6X/EG24N9K4 3WE6A6X/EG24N9K44WE6C6X/EG24N9K44WE...
【解析】解:7x+6y+7z=1000;x-2y+z=02;3x+y-2z=0,. ② ③ ①①-②×7得,20y=100, ∴y=5②*2+③ 得,5x-3y=0把y=5代入5x-3y=0得,x=3,把x=3,y=5代入②得,z=7=3方程组的解是y=5.z=7【三元一次方程及三元一次方程组的概念】1、三元一次方程:我们把含有三个未知数,并且含未知数...
Question: If you divide 7x by x, would it be 7 or 6x? Operations on Algebraic Expressions: Addition of Algebraic Expressions: Like terms can be added, but unlike terms cannot be added. For example, 11pqand6pqcan be added, i.e.,11pq+6pq=(11×pq)+(6×pq)=pq(11+6)=pq×17=17...
将y=4代入③得:x=5×4+2 ∴x=22 方程组的 \(x=22y=4. y=4 \(7x+6y-3=0y=1/2x+1/3. 将②代入①得: 7x+6*(1/2x+1/3)-3=0 7x+3x+2-3=0 10x=1 ∴x=1/(10) 将 x=1/(10) 代入②得 y=1/2*1/(10)+1/3 ∴y=(23)/(60) ∴ 方程组的解 \(x=1/(-30)y=...
/60→带定位销孔 NG6电磁换向阀4/2 4WE6D6X/SG24N9K4 70 NG6电磁换向阀4/2 4WE6Y6X/SG24N9K4 90 NG6电磁换向阀4/2 4WE6EA6X/SG24N9K4 68 NG6电磁换向阀4/2 4WE6EB6X/SG24N9K4 72 NG6电磁换向阀4/2 4WE6HB6X/SG24N9K4 75 NG6电磁换向阀4/3 4WE6E6X/SG24N9K4 53 NG6电磁换...
( 3 )- ( 4 )得:60.8x=-60 ∴ x= (75) (76) 将x= (75) (76)代入 ( 2 )得: (525) (76)+6y=66 即:6y= (4491) (76) ∴ y= (1497) (152) 故方程组的解为: \( (((array)(ll) (x= (75) (76)) \ (y= (1497) (152)) (array))) .结果...
7x+6y=20---① 3x-5y=1---② ①*3为 21x+18y=60 ②*7为 21x-35y=7 ①-②得18y+35y=53 53y=53 y=1 把y=1代入②式 3x-5=1 解得3x=6 x=2 所以x=2 y=1 7x+6y=20 35x+30y=
4WE6Y-50/AG24NZ5L 电磁阀 A2F012/61R-P2P06 柱塞泵 ZDR10DP2-4X/150YMV 叠加减压阀 ZDR6DP2-4X/75YM(DN6) 减压阀 ZDR10VP5-3X/200YM 减压阀 ZDR10DP1-40/10YM 叠加减压阀 DBDS10K1-1X/100 阀 DBW10AL-5X/1200-GEL24M9K 阀 DBDS10K1-1X/315 阀 4WRZ16E1150-5X/6A24Z4/D3M 阀 ZDC...
将y= 1 2代入方程左侧可得:4y-3 ( (20-y) )=2-60+ 3 2=-56 1 2,右侧可得:6y-7 ( (9-y) )=3-63+ 7 2=-56 1 2,两侧相等,方程成立 故该方程的解为:y= 1 2 (3)8x+4=2 ( (4x+3) )-2 ( (-x-4) ) 8x+4=8x+6+2x+8 2x=-10 x=-5 将x=-5代入方程左...