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1 单位换算。(每空1分,共8分)
$0.48L= ()mL$ $613mL= ()L$
$500cm^{3}= ()dm^{3}= ()L$ $3400cm^{2}= ()m^{2}$
$2000dm^{2}= ()m^{2}$ $7.82L= ()dm^{3}()cm^{3}$
$0.48L= ()mL$ $613mL= ()L$
$500cm^{3}= ()dm^{3}= ()L$ $3400cm^{2}= ()m^{2}$
$2000dm^{2}= ()m^{2}$ $7.82L= ()dm^{3}()cm^{3}$
答案
480 0.613 0.5 0.5
0.34 20 7 820
0.34 20 7 820
2 直接写出得数。(每题1分,共12分)
$3×0.4= $ $3.09+7.87= $ $7.24-1.54= $ $11.5+7.3= $
$9.2-8.1= $ $146.5-97.6= $ $1.5×30= $ $2.34×0.2= $
$1.6×0.5= $ $5.6+5.4= $ $11-3.6= $ $1.7+3.3×0.2= $
$3×0.4= $ $3.09+7.87= $ $7.24-1.54= $ $11.5+7.3= $
$9.2-8.1= $ $146.5-97.6= $ $1.5×30= $ $2.34×0.2= $
$1.6×0.5= $ $5.6+5.4= $ $11-3.6= $ $1.7+3.3×0.2= $
答案
1.2 10.96 5.7 18.8
1.1 48.9 45 0.468
0.8 11 7.4 2.36
1.1 48.9 45 0.468
0.8 11 7.4 2.36
3 计算下列各题,能简算的要简算。(每题3分,共18分)
$(1.25+2.5)×8$ $12.78-(4.97+2.78)$ $(45.9-32.7)÷8÷0.125$
$12.5×0.4×2.5×8$ $73-4.2÷0.1$ $[9.1-(4.27-3.07)]×4.2$
$(1.25+2.5)×8$ $12.78-(4.97+2.78)$ $(45.9-32.7)÷8÷0.125$
$12.5×0.4×2.5×8$ $73-4.2÷0.1$ $[9.1-(4.27-3.07)]×4.2$
答案
30 5.03 13.2
100 31 33.18
100 31 33.18
4 解方程。(每题4分,共12分)
$28.2-x= 14.1$ $7x÷3= 28$ $2×(4.5+x)= 13$
$28.2-x= 14.1$ $7x÷3= 28$ $2×(4.5+x)= 13$
答案
解:$x=14.1$ 解:$x=12$ 解:$x=2$
