100*с > 100:с;
700:х > 120:х;
876:z < 954:z;
b:3 > b:8;
d+1300 > d-700;
a+1200 < a+1400.
1) 3 3/4 + 1 1/8 = 15/4 + 9/8 = 30/8 + 9/8 = 39/8 = 4 7/8
4 7/8 • 2/13 = 39/8 • 2/13 = 3/4
2) 3 3/4 - 1 1/8 = 15/4 - 9/8 = 30/8 - 9/8 = 21/8= 2 5/8
2 5/8 : 2/13 = 21/8 • 13/2 = 273/16 = 17 1/16
Ответ: 1) 3/4 ; 2) 17 1/16
1 дм 2 см=12 см
93 дм=9 м 3 дм
17 см=1 дм 7см
68 см= 6 дм 8 см
2 м 4 дм=24 дм
1 дм 3 см=13 см
71 дм=7 м 10 см
10 см=1 дм
3 м 60 см=360 см
5 дм 40 см=90 см
X/3+2/0.05=40x/3
x/3+2/0.05-40x/3=0
-39x/3+40=0
-13x=-40
x=40/13=3 1/13
3 и 1/3 = 10/3
1.9 = 19/10
3 и 1/3 * 1.9 = 10/3 * 19/10 = 190/30 = 19/3
19.5 = 195/10
4 и 1/2 = 9/2
19.5 : 4 и 1/2 = 195/10 : 9/2 = 390/90 = 39/9 = 13/3
Числитель = 19/3 + 13/3 = 32/3
0.16 = 16/100 = 4/25
62/75 - 0.16 = 62/75 - 4/25 = (62 - 12)/75 = 2/3 - знаменатель
32/3 : (2/3) = (32 * 3)/(3 * 2) = 16