Хватит-8кл. Ушло-?на 2кл.б-ше. 8+2=10(кл.)ушло на свитер. ОТВЕТ:10клубков.
У*у + 5 = 21
у² = 21 - 5
у² = 16
у = ±√16
у = <span>±4
Ответ: у = -4; у = 4
Проверка:
(-4)*(-4)</span> + 5 = 21
16 + 5 = 21
21 = 21 верно
4*4 + 5 = 21
16 + 5 = 21
21 = 21 верно
<span>(c+d)*407
</span><span>c=670 d=31
</span>(670 + 31) × 407 = <span>285307
</span><span>670 + 31 = <span>701
</span></span><span>701 × 407 = <span>285307
</span></span><span>
c=258 d=902
</span>(258 + 902) × 407 = <span>472120
</span>258 + 902<span> = </span><span>1160
</span>1160 × 407<span> = </span>472120
<span>m:(706-k)
</span>m=5096 k=69
5096 / (706 − 69) = <span>8
</span>706 − 69<span> = </span>637
5096 / 637<span> = </span><span>8
</span>
m=6370 k=615
6370 / (706 − 615) = 70
706 − 615<span> = </span><span>91
</span>6370 / 91<span> = </span><span>70</span>