1) 1/7*49+1/2*1/4=7+1/8=7+0,125=7,125
2) а...12а⁴вх⁵у⁴/15а²в³х⁶у⁴= 4а²/5в²х
б...а²в
3) ((m-n)(m¹/²+n¹/²)-(m³/²-n³/²))/(m-n)= (m³/²-nm¹/²+mn¹/²-n³/²-m³/²+n³/²)/(m-n)=(mn¹/²-nm¹/²)/(m-n)=m¹/²n¹/²(m¹/²-n¹/²)/(m-n)=(mn)¹/²:(m¹/²-n¹/²)=√mn/(√m-√n)
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1.5
P = 2(a + b) = 22
S = a*b = 30
a + b = 11
a*b = 30
b*(11 - b) = 30
a = 11 - b
11b - b^2 - 30 = 0
b^2 - 11b + 30 = 0
D = 121 - 120 = 1
b1 = (11 + 1)/2 = 12/2 = 6
b2 = (11 - 1)/2 = 10/2 = 5
a1 = 11 - b1 = 11 - 6 = 5
b1 = 6
a2 = 11 - b2 = 11 - 5 = 6
b2 = 5
Ответ
5; 6