1-178; + 2-178; + 3-178; + 4-178; + 25-178; = 5525 2²+4²+6²+8².+50²=【 】
22100. I'll tell you why right now
2²+4²+6²+8².+50²
=(2×1)²+(2×2)²+(2×3)²+(2×4)²+… (2×25)²
=1²×2²+2²×2²+3²×2²+4²×2².+25²×2²
=4×(1²+2²+3²+4².+25²)
=4×5525
=22100
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