Bài 45 trang 11 SBT toán 6 tập 1

Tính nhanh: \(A = 26+27+28+29+30+31\)\(+32+33\) 

Lời giải

\(A = 26+27+28+29+30+31\)\(+32+33\)

\(= (26+33)+(27+32)+(28+31)\)\(+(29+30)  \)

\(= 59 + 59 + 59 + 59 \)\(= 59 . 4 = 236  \)


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