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一、口算。
$0.9÷0.45=$
$35\% ×0.2=$
$0.16+0.44=$
$\frac {8}{19}×\frac {5}{32}=$
$0.45+2.5=$
$42×\frac {4}{7}=$
$55÷\frac {11}{15}=$
$60\% ÷\frac {2}{3}=$
$0.9÷0.45=$
2
$0.55-50\% =$0.05
$30×75\% =$22.5
$35\% ×0.2=$
0.07
$66÷33\% =$200
$36\% +47.1\% =$0.831
$0.16+0.44=$
0.6
$4-\frac {3}{4}=$$3\frac{1}{4}$
$\frac {7}{16}×\frac {8}{5}=$$\frac{7}{10}$
$\frac {8}{19}×\frac {5}{32}=$
$\frac{5}{76}$
$13\% +0.77=$0.9
$28\% ÷0.56=$0.5
$0.45+2.5=$
2.95
$8.4×0.5=$4.2
$24\% ÷48\% =$0.5
$42×\frac {4}{7}=$
24
$\frac {3}{5}÷\frac {5}{3}=$$\frac{9}{25}$
$\frac {1}{7}+\frac {1}{9}=$$\frac{16}{63}$
$55÷\frac {11}{15}=$
75
$3.6-36\% =$3.24
$\frac {3}{10}×\frac {5}{6}=$$\frac{1}{4}$
$60\% ÷\frac {2}{3}=$
$\frac{9}{10}$
$30\% ×30\% =$0.09
$1-25\% =$75%
答案
一、2 0.05 22.5
0.07 200 0.831
0.6 $3\frac{1}{4}$ $\frac{7}{10}$
$\frac{5}{76}$ 0.9 0.5
2.95 4.2 0.5
24 $\frac{9}{25}$ $\frac{16}{63}$
75 3.24 $\frac{1}{4}$
$\frac{9}{10}$ 0.09 75%
0.07 200 0.831
0.6 $3\frac{1}{4}$ $\frac{7}{10}$
$\frac{5}{76}$ 0.9 0.5
2.95 4.2 0.5
24 $\frac{9}{25}$ $\frac{16}{63}$
75 3.24 $\frac{1}{4}$
$\frac{9}{10}$ 0.09 75%
二、计算下面各题，怎样简便就怎样计算。
$28.08÷2.6+7.2$ $32×25\% ×125\%$ $\frac {5}{8}×17.24-1.24÷\frac {8}{5}$
$98×23+46$ $6÷\frac {3}{5}-\frac {3}{5}÷6$ $0.8÷[(\frac {5}{8}-50\% )÷\frac {5}{8}]$
$28.08÷2.6+7.2$ $32×25\% ×125\%$ $\frac {5}{8}×17.24-1.24÷\frac {8}{5}$
$98×23+46$ $6÷\frac {3}{5}-\frac {3}{5}÷6$ $0.8÷[(\frac {5}{8}-50\% )÷\frac {5}{8}]$
答案
1.原式=10.8+7.2=18
2.原式=32×$\frac {1}{4}$×$\frac {5}{4}$=10
3.原式=$\frac {5}{8}$×(17.24-1.24)=10
4.原式=23×(98+2)=2300
5.原式=10-$\frac {1}{10}$=$9\frac {9}{10}$
6.原式=$\frac {4}{5}$÷$\frac {1}{5}$=4
2.原式=32×$\frac {1}{4}$×$\frac {5}{4}$=10
3.原式=$\frac {5}{8}$×(17.24-1.24)=10
4.原式=23×(98+2)=2300
5.原式=10-$\frac {1}{10}$=$9\frac {9}{10}$
6.原式=$\frac {4}{5}$÷$\frac {1}{5}$=4
