Question

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$\frac{7}{9}$¡Â$\frac{11}{5}$+$\frac{2}{9}$¡Á$\frac{5}{11}$£» $\frac{12}{13}$¡Á$\frac{3}{7}$+$\frac{4}{7}$¡Á$\frac{12}{13}$+$\frac{12}{13}$£» 2-$\frac{6}{13}$¡Â$\frac{9}{26}$-$\frac{2}{3}$£» 4¡Á0.8¡Á2.5¡Á12.5£®

Answer 1

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¢ÛÏȼÆËã³ý·¨£¬È»ºóÔËÓÃÒ»¸öÊýÁ¬Ðø¼õÈ¥Á½¸öÊý£¬¿ÉÒÔÓÃÕâ¸öÊý¼õÈ¥ÕâÁ½¸öÊýµÄºÍ£®
¢ÜÔËÓó˷¨µÄ½»»»Âɼ°½áºÏÂɽøÐмÆËã¼´¿É£®

½â´ð ½â£º¢Ù$\frac{7}{9}$¡Â$\frac{11}{5}$+$\frac{2}{9}$¡Á$\frac{5}{11}$
=$\frac{7}{9}$¡Á$\frac{5}{11}$+$\frac{2}{9}$¡Á$\frac{5}{11}$
=£¨$\frac{7}{9}$+$\frac{2}{9}$£©¡Á$\frac{5}{11}$
=$\frac{5}{11}$

¢Ú$\frac{12}{13}$¡Á$\frac{3}{7}$+$\frac{4}{7}$¡Á$\frac{12}{13}$+$\frac{12}{13}$
=$\frac{12}{13}$¡Á£¨$\frac{3}{7}$+$\frac{4}{7}$+1£©
=$\frac{24}{13}$


¢Û2-$\frac{6}{13}$¡Â$\frac{9}{26}$-$\frac{2}{3}$
=2-$\frac{6}{13}¡Á\frac{26}{9}$$-\frac{2}{3}$
=2-$\frac{4}{3}$$-\frac{2}{3}$
=2-2
=0

¢Ü4¡Á0.8¡Á2.5¡Á12.5
=£¨4¡Á2.5£©¡Á£¨12.5¡Á0.8£©
=10¡Á10
=100

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