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1. 填空:
(1)$10+7.2÷24=$
(2)$13.3-6.5+2\dfrac{1}{4}=$
(3)$3.14×10^{2}÷2=$
(4)$\dfrac{1}{2}×\dfrac{4}{3}÷4=$
(5)$\dfrac{1}{2}÷(2\dfrac{1}{3}-\dfrac{3}{4})=$
(6)$1\dfrac{1}{2}÷3^{2}+\dfrac{2}{5}=$
(7)$\dfrac{3}{4}×21-\dfrac{3}{4}×5=$
(8)$998×\dfrac{998}{999}=$
(1)$10+7.2÷24=$
10.3
;(2)$13.3-6.5+2\dfrac{1}{4}=$
9.05
;(3)$3.14×10^{2}÷2=$
157
;(4)$\dfrac{1}{2}×\dfrac{4}{3}÷4=$
$\dfrac{1}{6}$
;(5)$\dfrac{1}{2}÷(2\dfrac{1}{3}-\dfrac{3}{4})=$
$\dfrac{6}{19}$
;(6)$1\dfrac{1}{2}÷3^{2}+\dfrac{2}{5}=$
$\dfrac{17}{30}$
;(7)$\dfrac{3}{4}×21-\dfrac{3}{4}×5=$
12
;(8)$998×\dfrac{998}{999}=$
$997\dfrac{1}{999}$
.答案
1.(1)10.3 (2)9.05 (3)157 (4)$\dfrac{1}{6}$ (5)$\dfrac{6}{19}$ (6)$\dfrac{17}{30}$ (7)12 (8)$997\dfrac{1}{999}$
2. 计算:
(1) $14.15 - 4.75 + 1.85 - 2.25$;
(2) $21 ÷ ( \frac{1}{3} + \frac{2}{5} ) ÷ \frac{9}{11}$;
(3) $(4^2 - 2) × 0.25 × 1\dfrac{2}{7}$;
(4) $\frac{9}{8} × [ \frac{5}{9} ÷ ( \frac{2}{3} - \frac{1}{2} ) ]$;
(5) $[ 1 - ( 0.75 - \frac{3}{4} ÷ \frac{6}{5} ) ] × \frac{7}{8}$;
(6) $\frac{11}{18} ÷ [ 2 - ( \frac{1}{4} + \frac{5}{6} ) + \frac{11}{6} ]$;
(7) $\frac{8}{3} ÷ [ ( 2 + \frac{3}{4} - 0.25 ) × 4.8 ]$;
(8) $[ ( 3 + \frac{2}{9} × 1.5 ) + ( 6 ÷ 1\dfrac{4}{5} ) ] × 90\%$.
(1) $14.15 - 4.75 + 1.85 - 2.25$;
(2) $21 ÷ ( \frac{1}{3} + \frac{2}{5} ) ÷ \frac{9}{11}$;
(3) $(4^2 - 2) × 0.25 × 1\dfrac{2}{7}$;
(4) $\frac{9}{8} × [ \frac{5}{9} ÷ ( \frac{2}{3} - \frac{1}{2} ) ]$;
(5) $[ 1 - ( 0.75 - \frac{3}{4} ÷ \frac{6}{5} ) ] × \frac{7}{8}$;
(6) $\frac{11}{18} ÷ [ 2 - ( \frac{1}{4} + \frac{5}{6} ) + \frac{11}{6} ]$;
(7) $\frac{8}{3} ÷ [ ( 2 + \frac{3}{4} - 0.25 ) × 4.8 ]$;
(8) $[ ( 3 + \frac{2}{9} × 1.5 ) + ( 6 ÷ 1\dfrac{4}{5} ) ] × 90\%$.
答案
2.(1)9 (2)35 (3)$\dfrac{9}{2}$ (4)$\dfrac{15}{4}$ (5)$\dfrac{49}{64}$ (6)$\dfrac{2}{9}$ (7)$\dfrac{2}{9}$ (8)6
