5-2.(-3)
e^-x
-4x+y=5
-4x+4y=32
13+nb-(na*m)-1.962=0
na=nb*m
13*0.6-(na*m)*0.9-na*0.9=0
1/72+1/72+6/8+1/9+1/9 = 1
2x+4y=-18
2x+3y=-15
xx45
1/sin4A+cos8A/sin8A=cot2A-cosec8A
790019
3392110
2764070
1392723
6784220
5528140
30152860
33847540
6303104
12617841
11922701
11320711
3x+y=23
3x-2y=17