1) (-651) < (-328), 144 > (-148)
2. -1-(-27) = -1+27 = 26;
-125:(-5) = 25;
-3*(-6)-2 = 18-2 = 16;
-3*6-2 = -18-2 = -20;
25*17-35*27 = 425-945 = -520;
-56*15+56*25 = -840+1400 = 560;
-6*2+35 = -12+35 = 23;
-3*2-9 = -6-9 = -15
3. 57+(-30)+12+23+(-38)+(-27) = -3
4. -(98+49)-(102-49) = -147-53 = -200
(69+27)-(69-27) = 69+27-69+27 = 54
1) 63-7=56(лет)-на 56 лет бабушка старше внука.
2) 63:7=9(раз)-в 9 раз внук моложе бабушки.
<span>(2/15+1 7/12)×30/103 -2 :2 1/4×9 32 +2 1/3=(2/15+19/12)*30/103-2*4/9*9/32+7/3=(8+95)/60*30/103-8/32+7/3=1/2-1/4+7/3=(6-3+28)/12=31/12=2 7/12</span>
S=1/2*14*16*sin90=1/2*14*16*1=112 cм²