cos 45 = 0.7071 т.к АH=BH. значит угол АHB =90, угол НBA= 45
6m + m - 35 = 21
7m = 21 + 35
7m = 56
m = 56 : 7
m = 8
17n + 14n - 145 = 134
31n = 134 + 145
31n = 279
n = 279 : 31
n = 9
5n + 9n + 32 = 200
14n = 200 - 32
14n = 168
n = 168 : 14
n = 12
45,93*10=456,3
45,93*0,0001=0,46
60,09-4,3=55,79
324:1,8=180
1/2+1/3=5/6
2/3:5/9=2/3*9/5=1 1/5=1,2
5+2/3=5 2/3
2 7/8+0,23=3,105
-63:(-0,7)=90
-2:4-(-2,25:(-1/2))=-2-4,5=-6,5