113. Hisoblang:
1) 2•(-15):3; 2) (-0,4)•(-5):2;
3) 6•(-8):( -12); 4) (-6)•(-12):(-8);
5) (-45):3•(-2); 6) (-55):(-11)•(-3).
114. Ifodaning son =iymatini toping:
1) a3b2c2, bunda a==1, b=-3, c=2;
2) ab3c2, bunda a=-2, b=-1, c=-3;
3)
,
bunda
a=-2, b==3, c=-1;
4)
,
bunda a=8,
b=-1, c=-2.
115. > yoki < ishoralaridan foydalanib, tasdi=ni yozing:
1) -11,7- manfiy son; 2) 98,3- musbat son;
3) x- manfiy son; 4) y- musbat son.
116. a>0, b>0 bo`lsin. Isbotlang:
1) 2a(a+3b)>0; 2) (a+b)(2a+b)>0.
117. a<0, b<0 bo`lsin. Isbotlang:
1) 3a+4b<0; 2) 2a(a+b)>0.
118. a>0, b<0 bo`lsin. Isbotlang:
1) a-b>0; 2) b-a<0;
3) a2b=b3<0; 4) ab3=a3b<0.
119. Hisoblashlarni bajarmasdan, ifodaning qiymatini musbatmi yoki manfiymi
ekanligini aniqlang:
1) (-17)•(-1,281)2; 2) (-2,23)3•(-0,54)5;
3) (-0,37)3=(-2,7)5; 4) (-3,21)2•(-45,4)3.
120. a ning istalgan qiymatida ifodaning qiymatini musbat bo`lishini ko`rsating:
1)
2-
2)
a2+
3) (3a+2)2-6a(a+2); 4) (2a-3)2-3a(a-4).
121. a ning istalgan qiymatida ifodaning qiymati manfiy bo`lishini isbotlang.
1) (-1,5)3-a2; 2) (-7)5-(1-a)4;
3) 2a(4a-3)-(3a-1)2; 4) 3a(a+4)-(2a+3)2.
122. a<0, b>0 bo`lsin. Ifodaning qiymati musbatmi yoki manfiymi ekanini iniqlang:
1)
a3b4;
2)
3)
(2a-b)(2b-a);
4)
Tenglamani yeching (123-124):
123. 1) x(x=1)=0; 2) x(x-2)=0;
3) (x-2)(x=3)=0; 4) (x=4)(x=5)=0.
124. 1) (3x-1)(x=5)=0; 2) (2x=3)(x=1)=0;
3) (1=2x)(3x-2)=0; 4) (5x-3)(2=3x)=0.
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TO`G`RI CHIZIQ SOAT SFERBLATIDAGI SONLARNI IKKI GURUHGA BO`LADI. IKKALA GURUHDAGI SONLARNING YIG`INDISI BIR XIL BO`LISHI UCHUN TO`G`RI CHIZIQNI QANDAY O`TKAZISH KERAK? |
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