(7у+2)²-(4у-1)²=207
(5×2,1+3×1,9)²-(3×2,1+5×1,9)²=12,8
(4×3-3×2)²-(3×3-2×2)²=11
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(7у+2)²-(4у-1)²=207
(5×2,1+3×1,9)²-(3×2,1+5×1,9)²=12,8
(4×3-3×2)²-(3×3-2×2)²=11