Toán Lớp 6: a) 5/7 . -3/38 . 7/10 . 19/6
b) 3/7 . 9/11 + 3/7 . 5/11 – 3/7 . 25/11
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Toán Lớp 6: a) 5/7 . -3/38 . 7/10 . 19/6
b) 3/7 . 9/11 + 3/7 . 5/11 – 3/7 . 25/11
Comments ( 2 )
a)\dfrac{5}{7}.\dfrac{{ – 3}}{{38}}.\dfrac{7}{{10}}.\dfrac{{19}}{6}\\
= \dfrac{{5.\left( { – 3} \right).7.19}}{{7.38.10.6}}\\
= \dfrac{{ – 1995}}{{15960}}\\
= – \dfrac{1}{8}\\
b)\dfrac{3}{7}.\dfrac{9}{{11}} + \dfrac{3}{7}.\dfrac{5}{{11}} – \dfrac{3}{7}.\dfrac{{25}}{{11}}\\
= \dfrac{3}{7}.\left( {\dfrac{9}{{11}} + \dfrac{5}{{11}} – \dfrac{{25}}{{11}}} \right)\\
= \dfrac{3}{7}.\dfrac{{ – 11}}{{11}}\\
= \dfrac{3}{7}.\left( { – 1} \right)\\
= – \dfrac{3}{7}
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