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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: Tính tổng: S=1.4+2.5+3.6+4.7+…n.(n+3) Với n=1,2,3,…

Toán Lớp 6: Tính tổng:
S=1.4+2.5+3.6+4.7+…n.(n+3)
Với n=1,2,3,…

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222-9+11+12:2*14+14 = ? ( )

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