โจทย์เลขมัธยมศึกษาปีทที่ 2 (ตอน2)พร้อมเฉลย
Name: ________________________________
1. 8 x^2+68 x-8=35
2. 4 x^2+2 x-43=19
3. 2 x^2+8 x-16=27
4. 6 x^2+35 x-16=41
5. 6 x^2+21 x-28=11
6. 8 x^2+12 x-35=67
7. 5 x^2+10 x-56=52
8. 6 x^2+51 x-47=21
9. 9 x^2+49 x-52=0
10. 6 x^2+21 x-79=4
11. 8 x^2+46 x-74=70
12. 3 x^2+6 x-19=77
13. 8 x^2+16 x-79=47
14. 3 x^2+8 x-6=74
15. 2 x^2+4 x-7=71
16. 9 x^2+72 x-67=62
17. 8 x^2+3 x-31=37
18. 7 x^2+43 x-31=48
19. 3 x^2+21 x-16=2
20. 8 x^2+59 x-41=5
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Answer Sheet
1. {x=-17/4+5/4??15?^(1/2)?0.5912291827593,x=-17/4+(-5/4)??15?^(1/2)?-9.0912291827593}
2. {x=-1/4+1/4??249?^(1/2)?3.6949334595149,x=-1/4+(-1/4)??249?^(1/2)?-4.1949334595149}
3. {x=-2+1/2??102?^(1/2)?3.049752469181,x=-2+(-1/2)??102?^(1/2)?-7.049752469181}
4. {x=-35/12+1/12??2593?^(1/2)?1.326792352158,x=-35/12+(-1/12)??2593?^(1/2)?-7.1601256854913}
5. {x=-7/4+3/4??17?^(1/2)?1.3423292192133,x=-7/4+(-3/4)??17?^(1/2)?-4.8423292192133}
6. {x=-3/4+1/4??213?^(1/2)?2.8986298798316,x=-3/4+(-1/4)??213?^(1/2)?-4.3986298798316}
7. {x=-1+1/5??565?^(1/2)?3.7539457296019,x=-1+(-1/5)??565?^(1/2)?-5.7539457296019}
8. {x=-17/4+1/12??4233?^(1/2)?1.1717924465377,x=-17/4+(-1/12)??4233?^(1/2)?-9.6717924465377}
9. {x=-49/18+1/18??4273?^(1/2)?0.9093437767565,x=-49/18+(-1/18)??4273?^(1/2)?-6.3537882212009}
10. {x=-7/4+1/12??2433?^(1/2)?2.3604541517128,x=-7/4+(-1/12)??2433?^(1/2)?-5.8604541517128}
11. {x=9/4?2.25,x=-8}
12. {x=-1+?33?^(1/2)?4.744562646538,x=-1+(-1)??33?^(1/2)?-6.744562646538}
13. {x=-1+1/2??67?^(1/2)?3.0926763859362,x=-1+(-1/2)??67?^(1/2)?-5.0926763859362}
14. {x=4,x=-20/3?-6.6666666666667}
15. {x=-1+2??10?^(1/2)?5.3245553203368,x=-1+(-2)??10?^(1/2)?-7.3245553203368}
16. {x=-4+1/3??273?^(1/2)?1.5075705472861,x=-4+(-1/3)??273?^(1/2)?-9.5075705472861}
17. {x=-3/16+1/16??2185?^(1/2)?2.7339989731301,x=-3/16+(-1/16)??2185?^(1/2)?-3.1089989731301}
18. {x=-43/14+1/14??4061?^(1/2)?1.48042684753,x=-43/14+(-1/14)??4061?^(1/2)?-7.6232839903871}
19. {x=-7/2+1/2??73?^(1/2)?0.7720018726588,x=-7/2+(-1/2)??73?^(1/2)?-7.7720018726588}
20. {x=-59/16+1/16??4953?^(1/2)?0.7110970774782,x=-59/16+(-1/16)??4953?^(1/2)?-8.0860970774782}