1) 10,5 - 4х = 2 (целых) 1/3;
2) 20х + 15,4 =21;
3) 2,5х = 1/11;
4) 8х + 89 (целых) 2/9 = 90.
2) 20х + 15,4 =21;
3) 2,5х = 1/11;
4) 8х + 89 (целых) 2/9 = 90.
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Answers & Comments
-4х+21/2=2*1/3
-24+63=4
-24=-59
х=59/24
2)20х+15,4=21
20х=5,6
х=5,6/20
3)2,5х=1/11
х=1*1/11*2,5
х=1/11опять дробь 5/2
х=2/11*5
х=2/55
4)8х+89 2/9=90
8х+89*2/9=90
72х+89*2=810
72х+178=810
8=0 или 9х-79=0
х=79/9