10X-6Y + 3( 10-XY)= 77
BR & gt
7X-9Y = 47, click to view details X = 8, Y = 1, and click to view detailed error sum 8 and 1.
one half
China 2, click to see who the detailed X belongs to, and click to see the detailed mathematics 2/3 road X+4.
Language 2/3 x Click to view the attendance details (2/3x+4)+(2/3x)+4-x =1/3x+8.
China
1/3 road X+8 = 2/3 road (2/3 road X+4) Click to view details X = 48 BR>
1/3 road X+8 = 24, click to view the details. There are 48 students in the class. In the language of the math group, the number of participants in these two groups is 24.
China
3. Don't click to view details.
4. The theme is incomplete
China
5. Click to view the details: gold 5 times, silver 6 times, and copper (2 roads 5 times -5).
3 Road +5 times 6 times = 42, click to view details X = 2.
China
5 times = = 10, 6x 12, 2-way 5X-5 = 15, click to view details of gold 10, silver 12 and copper 15.
China Click to view the details.
6. Click View Details X+Y = 0 Y = -x Click View Details Substitution, click View Details 3X+5X = 2M, x =1/4m Click View Details 2X-7X = M- 18, X =( 18-M)/ 5.
China
1/4 road M =( 18-M)/ 5, click to view details M = 8.
China
X = 2 Click to view details Y = -2.
China
7. Click to view the details of X-shaped characters, B Y-shaped characters and acrylic Z-shaped characters. Click to view details {X+Y+Z = 86, click to view details 15 times: 3 = 12Y: 2 = 9Z: 1, and click to view details BR>
Set 15 times: 3 = 12y: 2 = 9z: 1 = k, click view details X = K/5, click view details Y = K/6, and click view details Z = K/9.
China
X+Y+Z = 43/90 Road K = 86
K = 180
China
X = 36，Y = 30，Z = 20