9х-26=30-5х
9х+5х=26+30
14х=56
х=56:14
х=4
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0.9х-7.4=-0.4х+4.3
0.9х+0.4х=7.4+4.3
1.3х=11.7
х=11.7 :1.3
х=9
150-18=132(исправных)
132/150=0,88
Ответ:0,88
9/13 - 108 км
5/13 - ? -остаток пути
5/13*108:9/13=60 км
108+60=168 км весь путь
39 = (30 + 9) : 3 = 10 + 3 = 13 13 * 3 = 39
52 = (40 + 12) : 4 = 10 + 3 = 13 13 * 4 = 52
84 = (42 + 42) : 2 = 21 + 21 = 42 42 * 2 = 84
75 = (50 + 25) : 5 = 10 + 5 = 15 15 * 5 = 75
91 = (70 + 21) : 7 = 10 + 3 = 13 13 * 7 = 91
1)975182 и 975184
2)831808 и 831810
3)915631 и 915633