Формула:
cos^2x-sin^2x=cos2x
<span>1)6,29:0,85+(53-48,184:5,6) = 51,7975
</span>6,29:0,85 = 7,4
48,184:5,6 = 8,6025
53 - 8,6025 = 44,3975
7,4 + 44,3975 = 51,7975<span>
2)5,33:0,65-(1,9218-0,8118):3 = 7,83
</span>5,33:0,65 = 8,2
1,9218-0,8118 = 1,11
1,11 : 3 = 0,37
8,2 - 0,37 = 7,83
(0,87m-0,66m)*10:2:3=0
0,12m*10:2:3=0
2,1m:2:3=0
1,05m:3=0
0,35m=0
m=0:0,35
m=0