Question

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помогите пжжжжжд​

Answer 1

1. 135²-35²=(135-35)(135+35)=100×170=17000

2. 17,5²-9,5² = (17,5-9,5)(17,5+9,5)   =  8×27 =  1×1   = 1  

   131,5²-3,5²   (131,5-3,5)(131,5+3,5)   128×135   16×5   80

3.  52²-37²+39²-36² =(52-37)(52+37)+(39-36)(39+36)=15×89+3×75= 4

    57²-32²  45²-30²   (57-32)(57+32)  (45-30)(45+30)  25×89 15×75  5  

4. 41²-17²-39²-17²=(41-17)(41+17) - (39-17)(31+17) =24×58-22×48=58 -2=140

   37²-31² 45²-21² (37-31)(37+31) (45-21)(45+21)   6×68  24×66  17    3  51