Toán Lớp 5: tính nhanh các tổng sau:
1/2+1/4+1/8+1/16+1/32
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Toán Lớp 5: tính nhanh các tổng sau:
1/2+1/4+1/8+1/16+1/32
Comments ( 2 )
Giải đáp + giải thích các bước giải:
1/2+1/4+1/8+1/16+1/32
=(1-1/2)+(1/2-1/4)+(1/4-1/8)+(1/8-1/16)+(1/16-1/32)
=1-1/32
=31/32
$\dfrac{1}{2}$+$\dfrac{1}{4}$-$\dfrac{1}{8}$+$\dfrac{1}{16}$+$\dfrac{1}{32}$
=1-$\dfrac{1}{2}$+$\dfrac{1}{2}$-$\dfrac{1}{4}$+$\dfrac{1}{4}$-$\dfrac{1}{8}$+$\dfrac{1}{8}$-$\dfrac{1}{16}$+$\dfrac{1}{16}$-$\dfrac{1}{32}$
=1-$\dfrac{1}{32}$
=$\dfrac{31}{32}$