125. Sonli tengsizlik ta’rifidan foydalanib, quyidagi sonlarni taqqoslang.

1) 0,3 va                                                           2)  va 0,3;

3)  va 0,35;                                                      4)  va -0,7.

126. Agar:

1) b-a=-1,3;                                                         2) b-a=0,001;

3) a-b=(-5)⁴;                                                        4) a-b=-5⁴

bo`lsa, a va b sonlarni taqqoslang.

127. a ning istalgan qiymatida:

1) a²>(a+1)(a-1);                                          2) (a+2)(a+4)>(a+1)(a+5)

Tengsizlikning tog`riligini isbotlang.

128. a ning istalgan qiymatida quyidagi tengsizlik to`g`ri bo`lishini isbotlang:

1)    a³<(a+1)(a¹²-a+1);

2)    (a+7)(a+1)<(a+2)(a+6);

3)    1+(3a+1)²>(1+2a)(1+4a);

4)    (3a-2)(a+2)<(1+2a)².

129. a va b ning istalgan qiymatida quyidagi tengsizlik to`g`ri bo`lishini isbotlang:

1)a(a+b)>ab-2;                                                   2) 2ab-1<b(2a+b);

3) 3ab-2<a(3b+a);                                              4) b(a+2b)>ab-3.

130. Ikki bola bir xil miqdorda markalar sotib oldi. Birnchisi olgan markalarning hammasi 50 so`mlikdan. Ikkinchisi olgan markalarning yarmi 30 so`mlikdan, qolganlari esa 60 so`mlikdan. Qaysi bola ko`proq pul sarflagan?