一、口算。(每题1分,共12分)
25×32=
2400÷80=
270+330=
3-$\frac{4}{3}$=
1.3×7=
92%÷2.3=
0.125×16=
$\frac{25}{44}×\frac{22}{5}$=
6.8-4.9=
$\frac{7}{10}÷\frac{1}{15}$=
$\frac{7}{8}-\frac{3}{40}$=
10%+$\frac{3}{5}$=
25×32=
800
2400÷80=
30
270+330=
600
3-$\frac{4}{3}$=
$\dfrac{5}{3}$
1.3×7=
9.1
92%÷2.3=
0.4
0.125×16=
2
$\frac{25}{44}×\frac{22}{5}$=
$\dfrac{5}{2}$
6.8-4.9=
1.9
$\frac{7}{10}÷\frac{1}{15}$=
$\dfrac{21}{2}$
$\frac{7}{8}-\frac{3}{40}$=
$\dfrac{4}{5}$
10%+$\frac{3}{5}$=
$\dfrac{7}{10}$
答案
一、800 30 600
$\dfrac{5}{3}$ 9.1 0.4
2 $\dfrac{5}{2}$ 1.9
$\dfrac{21}{2}$ $\dfrac{4}{5}$ $\dfrac{7}{10}$
$\dfrac{5}{3}$ 9.1 0.4
2 $\dfrac{5}{2}$ 1.9
$\dfrac{21}{2}$ $\dfrac{4}{5}$ $\dfrac{7}{10}$
二、解方程或比例。(每题3分,共27分)
1.5:2.5=x:7.5
$\frac{1}{3}:\frac{1}{10}=\frac{8}{9}:x$
1.3:x=5.2:20
$\frac{9}{22}x+\frac{1}{11}=\frac{3}{22}$
$\frac{7}{9}x+0.25=\frac{5}{4}$
(19%-x)×500%=$\frac{1}{4}$
5.6:$\frac{8}{7}$=63:$\frac{x}{7}$
$\frac{1}{8}x+\frac{1}{9}x=\frac{1}{48}$
(x-18%)÷$\frac{16}{9}$=18%
1.5:2.5=x:7.5
$\frac{1}{3}:\frac{1}{10}=\frac{8}{9}:x$
1.3:x=5.2:20
$\frac{9}{22}x+\frac{1}{11}=\frac{3}{22}$
$\frac{7}{9}x+0.25=\frac{5}{4}$
(19%-x)×500%=$\frac{1}{4}$
5.6:$\frac{8}{7}$=63:$\frac{x}{7}$
$\frac{1}{8}x+\frac{1}{9}x=\frac{1}{48}$
(x-18%)÷$\frac{16}{9}$=18%
答案
二、$x=4.5$ $x=\dfrac{4}{15}$ $x=5$
$x=\dfrac{1}{9}$ $x=\dfrac{9}{7}$ $x=\dfrac{7}{50}$
$x=90$ $x=\dfrac{3}{34}$ $x=50\%$
$x=\dfrac{1}{9}$ $x=\dfrac{9}{7}$ $x=\dfrac{7}{50}$
$x=90$ $x=\dfrac{3}{34}$ $x=50\%$
三、计算下面各题,怎样简便就怎样计算。(每题3分,共27分)
240×($\frac{1}{3}$+75%)
91÷1.25÷8+26.3
4.5×4.36+0.55×43.6
7÷$\frac{9}{11}$+2÷$\frac{9}{11}$
$\frac{17}{20}+\frac{3}{20}-60\%×1.5$
32×(1-37.5%)÷$\frac{5}{9}+\frac{1}{2}$
42×($\frac{2}{3}+\frac{3}{7}-\frac{9}{14}$)
0.95-$\frac{4}{11}$+3.05-$\frac{7}{11}$
90%÷[25%×($\frac{4}{15}$+40%)]
240×($\frac{1}{3}$+75%)
91÷1.25÷8+26.3
4.5×4.36+0.55×43.6
7÷$\frac{9}{11}$+2÷$\frac{9}{11}$
$\frac{17}{20}+\frac{3}{20}-60\%×1.5$
32×(1-37.5%)÷$\frac{5}{9}+\frac{1}{2}$
42×($\frac{2}{3}+\frac{3}{7}-\frac{9}{14}$)
0.95-$\frac{4}{11}$+3.05-$\frac{7}{11}$
90%÷[25%×($\frac{4}{15}$+40%)]
答案
三、260 35.4 43.6
11 0.1 $36\dfrac{1}{2}$
19 3 $\dfrac{27}{5}$
11 0.1 $36\dfrac{1}{2}$
19 3 $\dfrac{27}{5}$
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