Решение:
72+24=96 всего мест
72/96=3/4
1) 120:(4+2)=20
2)600-20=580
7/12 5/8
14/24 <15/24
3 7/9 3 5/6
3 14/18 <3 15/18
3 5/8×1 7/9×21/58=29/8×16/9×21/58=2/9×21/2=7/3=2 1/3
(2/9+5/6)×36=(4/18+15/18)×36=19/18×36=38
(4-7/8)×(3+1/5)=(3 8/8-7/8)×3 1/5=3 1/8×3 1/5=25/8×16/5=10
36×1 1/30/2,4=36×31/30/2,4=36×31/30×10/24=12×31×1/24=31/2=15 1/2
1.<span>2x +17=22+3x
2</span>x-3<span>x=22-17
-1</span><span>x=5
</span><span>x=5:(-1)
</span><span>x=-5
2.</span><span>18+3x=x+14
3</span>x-<span>x=14-18
2</span><span>x=-4
</span><span>x=-4:2
</span><span>x=-2
3.</span><span>25-4x=12-5x
-4</span>x+5<span>x=12-25
1</span><span>x=-13
</span><span>x=-13:1
</span>x--13
4.<span>13x+27=16x+4,5
13</span>x-16<span>x=4,5-27
-3</span><span>x=-22,5
</span><span>x=-22,5:(-3)
</span><span>x=7,5
5.</span><span>21x+45=17+14x
21</span>x-14<span>x=17-45
7</span><span>x=-28
</span><span>x=-28:7
</span><span>x=-4
6.</span><span>13x+70=2x+15
13</span>x-2<span>x=15-70
11</span><span>x=-55
</span><span>x=-55:11
</span><span>x=-5</span>