<span>1)-7,9+3,4=-4,5
2)-7,9-2,7=-10,6
3)5/12</span> - <span>132/12</span> = <span>5 - 132/12</span> = <span>-127/<span>12
4)</span></span>-7 <span>9/1</span> - 4 <span>1/3</span> = -16 - 4 <span>1/3</span> = -20 <span>1/<span>3
180.
1)x+14=8
x=8-14
x=-6
2)x+4,6=-9,4
x=-9,4-4,6
x=-14
3)2?9-x=14?7
-x=14,7-2,9
x=-11,8
4)-6,7-x=-4,2
-x=-4,2+6/7
x=-2,5
5)x-6,3=-5,24
x=-5,84+6,3
x=0,46</span></span>
1)=2ч18мин
2)=1ч36мин
3)=1ч30мин
4)=27мин
5)= 2ч33мин
45 +(8*x)=173
8*x = 173 - 45
8x = 128
x = 128 : 8
x = 16