① 用分数表示下列算式的商。(每题1分,共8分)
$7÷23=$
$29÷41=$
$17÷9=$
$2÷9=$
$27÷13=$
$13÷14=$
$23÷22=$
$13÷233=$
$7÷23=$
$29÷41=$
$17÷9=$
$2÷9=$
$27÷13=$
$13÷14=$
$23÷22=$
$13÷233=$
答案
$7÷23=\frac{7}{23}$
$29÷41=\frac{29}{41}$
$17÷9=\frac{17}{9}$
$2÷9=\frac{2}{9}$
$27÷13=\frac{27}{13}$
$13÷14=\frac{13}{14}$
$23÷22=\frac{23}{22}$
$13÷233=\frac{13}{233}$
$29÷41=\frac{29}{41}$
$17÷9=\frac{17}{9}$
$2÷9=\frac{2}{9}$
$27÷13=\frac{27}{13}$
$13÷14=\frac{13}{14}$
$23÷22=\frac{23}{22}$
$13÷233=\frac{13}{233}$
② 直接写出得数。(每题1分,共12分)
$1.5÷0.3=$
$125×8=$
$7.5-6.5=$
$12.5÷0.25=$
$4.8+6=$
$0.25×0.4=$
$3.9÷0.65=$
$428+395=$
$9.75-2.98=$
$110.2-37.9=$
$1650-936=$
$7.6-6.9=$
$1.5÷0.3=$
$125×8=$
$7.5-6.5=$
$12.5÷0.25=$
$4.8+6=$
$0.25×0.4=$
$3.9÷0.65=$
$428+395=$
$9.75-2.98=$
$110.2-37.9=$
$1650-936=$
$7.6-6.9=$
答案
$1.5÷0.3=2.5$
$125×8=1000$
$7.5-6.5=1$
$12.5÷0.25=50$
$4.8+6=10.8$
$0.25×0.4=0.1$
$3.9÷0.65=6$
$428+395=823$
$9.75-2.98=6.77$
$110.2-37.9=72.3$
$1650-936=714$
$7.6-6.9=0.7$
$125×8=1000$
$7.5-6.5=1$
$12.5÷0.25=50$
$4.8+6=10.8$
$0.25×0.4=0.1$
$3.9÷0.65=6$
$428+395=823$
$9.75-2.98=6.77$
$110.2-37.9=72.3$
$1650-936=714$
$7.6-6.9=0.7$
③计算。(每题3分,共18分)
$3.2×25×1.25$
$9.42×10-94.2×0.9$
$0.25×6.19×0.4$
$5.6+5.6×9$
$12.5×4.12×0.8$
$13÷0.4÷2.5$
$3.2×25×1.25$
$9.42×10-94.2×0.9$
$0.25×6.19×0.4$
$5.6+5.6×9$
$12.5×4.12×0.8$
$13÷0.4÷2.5$
答案
$3.2×25×1.25=100$
$9.42×10-94.2×0.9=9.42$
$0.25×6.19×0.4=0.619$
$5.6+5.6×9=56$
$12.5×4.12×0.8=41.2$
$13÷0.4÷2.5=13$
$9.42×10-94.2×0.9=9.42$
$0.25×6.19×0.4=0.619$
$5.6+5.6×9=56$
$12.5×4.12×0.8=41.2$
$13÷0.4÷2.5=13$
④ 解方程。(每题4分,共12分)
$4×2.5+8x=11.6$
$6(x+0.2)=4.8$
$0.5x-3×1.4=20.8$
$4×2.5+8x=11.6$
$6(x+0.2)=4.8$
$0.5x-3×1.4=20.8$
答案
解:$x=0.2$ 解:$x=0.6$ 解:$x=50$
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