直接写得数。66.8+21.9=90%-0.8=30÷80%=5.5÷0.5=

基础巩固换一批

66.8+21.9=	90%-0.8=	30÷80%=	5.5÷0.5=
$\text{[math]}$	$\text{[math]}$	$\text{[math]}$	$\text{[math]}$

1-15%=	24÷5	$25 % \div \frac{1}{4} =$	$\frac{7}{8} \times \frac{4}{21} =$
$\frac{5}{6} \times 3 = .$	$\frac{3}{7} \times \frac{14}{15} =$	10%+1%=	1-25%-60%=

$\frac{4}{5} \times \frac{5}{16} =$	$0.3 + \frac{1}{5} =$	$32 \times 12.5 % =$	3.14×9=
8.1÷0.3=	3.14×16=	$44 \div \frac{11}{10} =$	$0 . 1^{2} =$

×8＝	÷＝	×＝	1÷25%＝
$\frac{8}{9}$ ÷4＝	$\frac{5}{8}$ × $\frac{4}{15}$ ＝	$\frac{5}{7}$ ÷ $\frac{5}{2}$ ＝	2.4× $\frac{1}{3}$ ＝

1. 直接写得数。66.8+21.9=90%-0.8=30÷80%=5.5÷0.5=