3*x-80:4=25
x=(25+80:4):3
x=15
3*15-80*4=25
25=25
3(целых)<span>3/8</span> × 1(целых)<span>1/15</span> = <span>3 + 3·8/8</span> × <span>1 + 1·15/15</span> = <span>27/8</span> × <span>16/15</span> = <span>27·16/8·15</span> = <span>432/120</span> = <span><span>18·24/</span><span>5·24</span></span> = <span>18/5</span> = <span>3 + 3·55</span> = 3(целых)<span>3/5</span> = 3.6
Значит получается:
4/45+14/45=18/45
А 18/45=0,4
1) 51.26-5.603=45.657
2) 45.657:8.9= 5.13
3) 18.7*0.6= 11.22
4) 5.13*11.22= 16.35
2). 27 118 - 1 997= 25 121
3). 8099-1007+5818=12910