-5 х= 16
х= 16: (-5)
х= - 3 целые 1/5
икс рано- три целые одна пятая
<span>(х+5)² - (х-1)²=82
x^2 +10x +25 - x^2 +2x-1 = 82
10x +2x +25 - 1 = 82
12x+24 = 82
12x = 58
x = 58/12
x = 4 и 5/6</span>
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9/20=9:20=0,45
7/40=7:40=0,175
11/400=11:400=0,0275
21/168=21:168=0,125
35/280=35:280=0,125
47/376=47:376=0,125
надеюсь я тебя првильно понял