Toán Lớp 5: Tính nhanh :
a, 1/2 +1/4 + 1/8+ 1/16+ 1/32+ 1/64
B, 1/2×3 + 1/3×4 + 1/4×5 + 1/5×6
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Toán Lớp 5: Tính nhanh :
a, 1/2 +1/4 + 1/8+ 1/16+ 1/32+ 1/64
B, 1/2×3 + 1/3×4 + 1/4×5 + 1/5×6
Comments ( 2 )
a)=32/64+16/64+4/64+2/64+1/64= 55/64.