Toán Lớp 7: Tính 1/23 + 2/57 + 1 + 8/19 + 9/20

Toán Lớp 7: Tính 1/23 + 2/57 + 1 + 8/19 + 9/20

TRẢ LỜI

1. quynhthanhnhu
$\dfrac{1}{23}$ $+$ $\dfrac{2}{57}$ $+$ $1$ $+$ $\dfrac{8}{19}$ $+$ $\dfrac{9}{20}$
$=$ $\dfrac{103}{1311}$ $+$ $1$ $+$ $\dfrac{8}{19}$ $+$ $\dfrac{9}{20}$
$=$ $\dfrac{1414}{1311}$ $+$ $\dfrac{8}{19}$ $+$ $\dfrac{9}{20}$
$=$ $\dfrac{1966}{1311}$ $+$ $\dfrac{9}{20}$
$=$ $1,9496….$

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