1)7,4; 0,9; 3,2; 12; 9,6
2)0,28; 4,04; 19,62; 3,41; 6,48
3)0,675; 4,233; 8,986; 29,481
- 3 1/2- (- 1 3/4)= -7/2+ 7/4= -14/4+7/4=-7/4= -1 3/4
2 2/3- 3 5/9= 8/3- 32/9=24/9-32/9= - 8/9
<span>1)x+9.7/10=28.2/15
x+0.97=1.88
x=</span>1.88-0.97
x=0.91
2)<span>6.3/11+b=11.93/121
</span>x+63/110=1193/12100
x=1193/12100 - 63/110 =-5737/12100
3)<span>9.5/36-х=2.4/9
19/72-x=4/15
x=-1/360
4)</span>к-5.17/60=7.9/20
k-517/6000=0.395
k=0.395+ 517/6000
k=2887/6000
25:100*60=15 мальчики
25-15=10 девочки