Lim ( x^2 +3x -10)/(x^2 +2x-3)=a/b x->2 Tính min a.b (a,b thuộc z, bkhác 0)

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Bài 1: Tìm x, biết 45+x=36 A. x=9 B. x=-9 C. x=81 D. x=-81 Bài 2: Tìm x, biết -27+x=42 A. x=15 B. x=-15 C. x=-69 D. x=69 Bài 3: Tìm x, biết - 43- x = -59 A. x= 16 B. x=-16 C. x= 102 D. x=-102 Bài 4: Tìm x, biết -39 - (-x) = -21 A. x=-60 B. x=60 C. x= 18 D. x=-18 Bài 5: Tìm x, biết - 45 – x - 27 = -27 A. x=-45 B. x= 45 C. x= -82 D. x=82 Bài 6: Tìm x, biết -19+x - 41 = - 60 A. x= -120 B. x=120 C. x=-38 D. x=0 Bài 7: Tìm x, biết 31- (48 -x) = - 48 A. x=31 B. x= -31 C. x=-127 D. x=127 Bài 8: Tìm x, biết |x|= 2 A. x=2 B. x=-2 C. x=2; -2 D. x∈ {2; −2} Bài 9: Tìm x, biết |x|= -5 A. x=5 B. x=-5 C. x∈ {5; −5} D. x không có giá trị Bài 10: Tìm x, biết |x| +7 =11 A. x∈ {4; −4} B. x=4 C. x=-4 D. x không có giá trị Bài 11: Tìm x, biết |x| +19 = 12 A. x=7 B. x=-7 C. x∈ {7; −7} D. x không có giá trị Bài 12: Tìm x, biết |x| - 35 = - 12 A. x=- 47 B. x=-23 C. x∈ {23; −23} D. x không có giá trị Bài 13: Tìm x, biết 47- (x-56) = 32 A. x=71 B. x=41 C. x= −41 D.x=23 Bài 14: Tìm x, biết (76 –x) +42= 83 A. x=-35 B. x= 191 C. x=35 D. x = 117 Bài 15: Tìm x, biết 16- (-37+x) =69 A. x= 122 B. x=48 C. x= −16 D. x =13 Bài 16: Tìm x, biết - 65 + (48-x)=-126 A. x= -109 B. x=109 C. x=-13 D. x =13 Bài 17: Tìm x, biết x 2 – 4 =0 A. x=2 B. x= -2 C. x∈ {2; −2} D. x không có giá trị Bài 18: Tìm x, biết (x-1).(x+2019)=0 A. x=1 B. x=-2019 C. x∈ {1; −2019} D. x không có giá trị Bài 19: Tìm x, biết 20+ x 2 = −44 A. x=- 64 B. x∈ {−8; 8} C. x∈ {−64; 64} D. x không có giá trị Bài 20: Tìm x, biết -29+ x 2 = −13 A. x=16 B. x∈ {−4; 4} C. x∈ {−16; 16} D. x không có giá trị