1. Katta yoshdagi kishilar ta’lim-tarbiyasi masalalariga doir bo’lgan pedagogikaning tarmog’i…

69. b ning qanday qiymatida 9x²+ bx+1 tenglama yagona echimga ega bo`ladi.

*c). 7

70. b ning kanday kiymatlarida - 9 = b tenglama uchta ildizga ega buladi?

*a). 9

71. |x| + |y| < 100 tenglama nechta har xil butun echimlarga ega?

*b). 19801

72. |x| × (x² – 4) = -1 tenglama nechta ildizga ega?

*b). 4

73. Tenglamani yeching, eng kichik ildizni ko`rsating.

*c). 1

74. Tenglamanini yeching: - 1 =1

*c). -1;1;3

75. Tenglamani yeching (x+1)(x+2)(x+4)(x+5)=40 , ( )

*c). -6

76. funktsiyaning eng katta qiymatini toping (a > 0, b > 0) .

*d).

77. Agar a + b = 1 bo`lsa, a⁴ + b⁴ ning eng kichik qiymatini toping.

*c). d).