第75页 - 强化拓展卷六年级数学苏教版提优版

$=47×99+47×1$

$=47×(99+1)$

$=47×100$

$=4700$

$ =40×8×25×1.25$

$ =(40×25)×(8×1.25)$

$ =1000×10$

$ =10000$

$=127÷(2.5×4)$

$=127÷10$

$=12.7$

$=\frac {2}{3}+\frac {1}{6}$

$=\frac {4}{6}+\frac {1}{6}$

$=\frac {5}{6}$

$=\frac {9}{10}÷(\frac {1}{2}×\frac {9}{10})$

$=\frac {9}{10}÷\frac {9}{20}$

$=\frac {9}{10}×\frac {20}{9}$

$=2$

$=\frac {4}{5}×(\frac {7}{9}+\frac {2}{9})$

$=\frac {4}{5}×1$

$=\frac {4}{5}$

$=9\frac {9}{20}－\frac {5}{8}+\frac {11}{20}－\frac {3}{8}$

$=(9\frac {9}{10}+\frac {11}{20})－(\frac {5}{8}+\frac {3}{8})$

$=10－1$

$=9$

$=(\frac {9}{15}+\frac {5}{15})×\frac {5}{4}+\frac {3}{4}$

$=\frac {14}{15}×\frac {5}{4}+\frac {3}{4}$

$=\frac {7}{6}+\frac {3}{4}$

$=\frac {14}{12}+\frac {9}{12}$

$=\frac {23}{12}$

$=16.25+6.72－4.25－3.72$

$=(16.25－4.25)+(6.72－3.72)$

$=12+3$

$=15$

$ =0.4×(1÷0.05)$

$ =0.4×20$

$ =8$

$=24+45－30$

$=39$

$=1.68÷(4.8－4.6)$

$=1.68÷0.2$

$=8.4$