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1. 填空:
(1)$4.2×0.7=$
(2)$0.6÷0.03=$
(3)$21+4.6-5^{2}=$
(4)$\frac{1}{3}+(2-\frac{1}{2})=$
(5)$\frac{2}{11}×9÷\frac{9}{22}=$
(6)$0.125×8÷0.125×8=$
(7)$1000×2.2\%÷\frac{1}{5}=$
(8)$2.5×3\frac{1}{2}×0.4=$
(1)$4.2×0.7=$
2.94
;(2)$0.6÷0.03=$
20
;(3)$21+4.6-5^{2}=$
0.6
;(4)$\frac{1}{3}+(2-\frac{1}{2})=$
$\frac{11}{6}$
;(5)$\frac{2}{11}×9÷\frac{9}{22}=$
4
;(6)$0.125×8÷0.125×8=$
64
;(7)$1000×2.2\%÷\frac{1}{5}=$
110
;(8)$2.5×3\frac{1}{2}×0.4=$
3.5
.答案
1.(1)2.94 (2)20 (3)0.6 (4)$\frac{11}{6}$ (5)4 (6)64 (7)110 (8)3.5
2. 计算:
(1)$5.3+(17.13-4.7)+0.87$;
(2)$\frac{10}{17}+\frac{18}{35}×\frac{7}{4}+\frac{1}{10}$;
(3)$1÷( \frac{1}{7}÷\frac{1}{9} )×2\frac{1}{4}$;
(4)$\frac{7}{13}×\frac{4}{5}+\frac{6}{13}÷\frac{5}{4}$;
(5)$( \frac{1}{4}+\frac{1}{6}-\frac{1}{3} )÷\frac{5}{12}$;
(6)$\frac{18}{19}÷(2×5^2)+\frac{1}{25}÷\frac{19}{10}$;
(7)$( 4×3×\frac{8}{3} )-0.6÷\frac{5}{8}$;
(8)$20\%×( \frac{3}{5}+0.75-\frac{4}{5} )+\frac{9}{10}$.
(1)$5.3+(17.13-4.7)+0.87$;
(2)$\frac{10}{17}+\frac{18}{35}×\frac{7}{4}+\frac{1}{10}$;
(3)$1÷( \frac{1}{7}÷\frac{1}{9} )×2\frac{1}{4}$;
(4)$\frac{7}{13}×\frac{4}{5}+\frac{6}{13}÷\frac{5}{4}$;
(5)$( \frac{1}{4}+\frac{1}{6}-\frac{1}{3} )÷\frac{5}{12}$;
(6)$\frac{18}{19}÷(2×5^2)+\frac{1}{25}÷\frac{19}{10}$;
(7)$( 4×3×\frac{8}{3} )-0.6÷\frac{5}{8}$;
(8)$20\%×( \frac{3}{5}+0.75-\frac{4}{5} )+\frac{9}{10}$.
答案
2.(1)18.6 (2)$1\frac{10}{17}$ (3)$\frac{7}{4}$ (4)$\frac{4}{5}$ (5)$\frac{1}{5}$ (6)$\frac{1}{25}$ (7)$31\frac{1}{25}$ (8)1.01
