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b) -2,8 + (11¼) =-2,8+11,25=8,45
c) √⁴/₉ × √2¼ = √4/√9 ×√9/√4=2/3 ×3/2=1
d) 5 × 3⅕ - o,5² - √⁹/₁₆ = 5 ×16/5-1/4-√9/√16=16-1/4-3/4=15
e) √⅛ + (-2)⁴ - ⅛ = 0,35+4=4,35
f) -(-7)² + √49 =-49+7=-42
g) -4² ÷ 2³ + ⅓ ³√27 =16:8+⅓*3=2+1=3
h) [-2 × (-3,3)] ÷ (-2⅕) + 7¼ = 33/5:-(-11/5)+ 7¼=33/5 *(-5//11)+ 7¼= -3+ 7¼= 4¼