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72:8×9-30:5×7+56:7×8-90:10×5

Răspuns :

9x9-6x7+8x8-9x5=
81-42+56-45=39-11=28

9 x 9 - 6 x 7 + 8 x 8 - 9 x 5=
81-42+64-45= 58