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一、口算。
$2.2 - 1.55=$ $6.9÷0.6=$ $8.24 + 3.76=$
$5.6÷0.7=$ $4.1 - 3.8=$ $0.32÷0.16=$
$62.5×80=$ $6.4÷16=$ $0.6×0.15=$
$0.73 + 1.5=$ $1 - 0.03=$ $4.86÷0.9=$
$2.4÷8=$ $250×0.04=$ $1.68 + 2.43=$
$\frac{11}{12}-\frac{5}{8}=$ $\frac{5}{7}-\frac{10}{21}=$ $\frac{13}{4}+\frac{5}{6}=$
$\frac{5}{6}+\frac{11}{18}=$ $\frac{2}{5}+\frac{5}{12}=$ $\frac{7}{10}-\frac{2}{5}=$
$\frac{8}{7}-\frac{3}{4}=$ $\frac{5}{8}-\frac{1}{6}=$ $\frac{2}{5}+\frac{3}{8}=$
$\frac{5}{21}+\frac{6}{7}=$ $\frac{3}{10}+\frac{2}{7}=$ $\frac{8}{9}-\frac{1}{2}=$
$\frac{3}{4}+\frac{1}{2}=$ $\frac{6}{7}-\frac{3}{10}=$ $\frac{1}{3}-\frac{1}{5}=$
$2.2 - 1.55=$ $6.9÷0.6=$ $8.24 + 3.76=$
$5.6÷0.7=$ $4.1 - 3.8=$ $0.32÷0.16=$
$62.5×80=$ $6.4÷16=$ $0.6×0.15=$
$0.73 + 1.5=$ $1 - 0.03=$ $4.86÷0.9=$
$2.4÷8=$ $250×0.04=$ $1.68 + 2.43=$
$\frac{11}{12}-\frac{5}{8}=$ $\frac{5}{7}-\frac{10}{21}=$ $\frac{13}{4}+\frac{5}{6}=$
$\frac{5}{6}+\frac{11}{18}=$ $\frac{2}{5}+\frac{5}{12}=$ $\frac{7}{10}-\frac{2}{5}=$
$\frac{8}{7}-\frac{3}{4}=$ $\frac{5}{8}-\frac{1}{6}=$ $\frac{2}{5}+\frac{3}{8}=$
$\frac{5}{21}+\frac{6}{7}=$ $\frac{3}{10}+\frac{2}{7}=$ $\frac{8}{9}-\frac{1}{2}=$
$\frac{3}{4}+\frac{1}{2}=$ $\frac{6}{7}-\frac{3}{10}=$ $\frac{1}{3}-\frac{1}{5}=$
答案
$0.65 11.5 128 0.3 25000 0.4 0.092.23 0.97 5.40.3 10 4.11\frac{7}{24} \frac{5}{21} \frac{49}{12}\frac{13}{9} \frac{49}{60} \frac{3}{10}\frac{11}{28} \frac{11}{24} \frac{31}{40}\frac{23}{21} \frac{41}{70} \frac{7}{18}\frac{5}{4} \frac{39}{70} \frac{2}{15}$
二、解方程。
$7.2x = 36$ $x - 0.38x = 7.75$ $7x - 3.6×4.3 = 32.61$
$7.2x = 36$ $x - 0.38x = 7.75$ $7x - 3.6×4.3 = 32.61$
答案
x = 5
x = 12.5
x = 6.87
x = 12.5
x = 6.87
