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1. 直接写出得数。
$\frac{4}{15}+\frac{1}{2}=$
$\frac{1}{7}×\frac{2}{3}=$
$\frac{15}{16}×\frac{4}{25}=$
$\frac{6}{5}-\frac{7}{10}=$
$\frac{8}{9}÷\frac{1}{3}=$
$2÷\frac{1}{12}=$
$\frac{6}{11}+\frac{5}{11}=$
$0.9÷\frac{3}{20}=$
$1\frac{3}{4}×\frac{1}{8}=$
$\frac{6}{5}+\frac{7}{10}=$
$\frac{8}{13}×\frac{26}{4}=$
$2+\frac{5}{12}=$
$\frac{6}{8}-\frac{1}{2}=$
$\frac{9}{16}÷\frac{3}{20}=$
$\frac{3}{64}×\frac{56}{9}=$
$\frac{4}{15}+\frac{1}{2}=$
$\frac{1}{7}×\frac{2}{3}=$
$\frac{15}{16}×\frac{4}{25}=$
$\frac{6}{5}-\frac{7}{10}=$
$\frac{8}{9}÷\frac{1}{3}=$
$2÷\frac{1}{12}=$
$\frac{6}{11}+\frac{5}{11}=$
$0.9÷\frac{3}{20}=$
$1\frac{3}{4}×\frac{1}{8}=$
$\frac{6}{5}+\frac{7}{10}=$
$\frac{8}{13}×\frac{26}{4}=$
$2+\frac{5}{12}=$
$\frac{6}{8}-\frac{1}{2}=$
$\frac{9}{16}÷\frac{3}{20}=$
$\frac{3}{64}×\frac{56}{9}=$
答案
$\frac{4}{15}+\frac{1}{2}=\frac{8}{30}+\frac{15}{30}=\frac{23}{30}$
$\frac{1}{7}×\frac{2}{3}=\frac{1×2}{7×3}=\frac{2}{21}$
$\frac{15}{16}×\frac{4}{25}=\frac{3}{4}×\frac{1}{5}=\frac{3}{20}$
$\frac{6}{5}-\frac{7}{10}=\frac{12}{10}-\frac{7}{10}=\frac{5}{10}=\frac{1}{2}$
$\frac{8}{9}÷\frac{1}{3}=\frac{8}{9}×3=\frac{8}{3}$
$2÷\frac{1}{12}=2×12=24$
$\frac{6}{11}+\frac{5}{11}=\frac{6+5}{11}=1$
$0.9÷\frac{3}{20}=\frac{9}{10}×\frac{20}{3}=6$
$1\frac{3}{4}×\frac{1}{8}=\frac{7}{4}×\frac{1}{8}=\frac{7}{32}$
$\frac{6}{5}+\frac{7}{10}=\frac{12}{10}+\frac{7}{10}=\frac{19}{10}$
$\frac{8}{13}×\frac{26}{4}=2×2=4$
$2+\frac{5}{12}=2\frac{5}{12}$
$\frac{6}{8}-\frac{1}{2}=\frac{6}{8}-\frac{4}{8}=\frac{2}{8}=\frac{1}{4}$
$\frac{9}{16}÷\frac{3}{20}=\frac{9}{16}×\frac{20}{3}=\frac{15}{4}$
$\frac{3}{64}×\frac{56}{9}=\frac{1}{8}×\frac{7}{3}=\frac{7}{24}$
$\frac{1}{7}×\frac{2}{3}=\frac{1×2}{7×3}=\frac{2}{21}$
$\frac{15}{16}×\frac{4}{25}=\frac{3}{4}×\frac{1}{5}=\frac{3}{20}$
$\frac{6}{5}-\frac{7}{10}=\frac{12}{10}-\frac{7}{10}=\frac{5}{10}=\frac{1}{2}$
$\frac{8}{9}÷\frac{1}{3}=\frac{8}{9}×3=\frac{8}{3}$
$2÷\frac{1}{12}=2×12=24$
$\frac{6}{11}+\frac{5}{11}=\frac{6+5}{11}=1$
$0.9÷\frac{3}{20}=\frac{9}{10}×\frac{20}{3}=6$
$1\frac{3}{4}×\frac{1}{8}=\frac{7}{4}×\frac{1}{8}=\frac{7}{32}$
$\frac{6}{5}+\frac{7}{10}=\frac{12}{10}+\frac{7}{10}=\frac{19}{10}$
$\frac{8}{13}×\frac{26}{4}=2×2=4$
$2+\frac{5}{12}=2\frac{5}{12}$
$\frac{6}{8}-\frac{1}{2}=\frac{6}{8}-\frac{4}{8}=\frac{2}{8}=\frac{1}{4}$
$\frac{9}{16}÷\frac{3}{20}=\frac{9}{16}×\frac{20}{3}=\frac{15}{4}$
$\frac{3}{64}×\frac{56}{9}=\frac{1}{8}×\frac{7}{3}=\frac{7}{24}$
2. 解方程。
$3x+6x=1.8$
$7x-5x=24$
$19-3x=1$
$5x+\frac{1}{2}=\frac{7}{10}$
$1.2x=48$
$\frac{2}{3}x-\frac{1}{6}x=\frac{1}{4}$
$x+\frac{3}{4}x=\frac{7}{8}$
$\frac{5}{6}x-\frac{1}{4}=\frac{3}{8}$
$x÷3=4.6+5.6$
$3x+6x=1.8$
$7x-5x=24$
$19-3x=1$
$5x+\frac{1}{2}=\frac{7}{10}$
$1.2x=48$
$\frac{2}{3}x-\frac{1}{6}x=\frac{1}{4}$
$x+\frac{3}{4}x=\frac{7}{8}$
$\frac{5}{6}x-\frac{1}{4}=\frac{3}{8}$
$x÷3=4.6+5.6$
答案
解：$3x+6x=1.8$
$9x=1.8$
$x=1.8÷9$
$x=0.2$
解：$7x-5x=24$
$2x=24$
$x=24÷2$
$x=12$
解：$19-3x=1$
$3x=19-1$
$3x=18$
$x=18÷3$
$x=6$
解：$5x+\frac{1}{2}=\frac{7}{10}$
$5x=\frac{7}{10}-\frac{1}{2}$
$5x=\frac{7}{10}-\frac{5}{10}$
$5x=\frac{1}{5}$
$x=\frac{1}{5}÷5$
$x=\frac{1}{25}$
解：$1.2x=48$
$x=48÷1.2$
$x=40$
解：$\frac{2}{3}x-\frac{1}{6}x=\frac{1}{4}$
$\frac{4}{6}x-\frac{1}{6}x=\frac{1}{4}$
$\frac{1}{2}x=\frac{1}{4}$
$x=\frac{1}{4}÷\frac{1}{2}$
$x=\frac{1}{2}$
解：$x+\frac{3}{4}x=\frac{7}{8}$
$\frac{7}{4}x=\frac{7}{8}$
$x=\frac{7}{8}÷\frac{7}{4}$
$x=\frac{1}{2}$
解：$\frac{5}{6}x-\frac{1}{4}=\frac{3}{8}$
$\frac{5}{6}x=\frac{3}{8}+\frac{1}{4}$
$\frac{5}{6}x=\frac{3}{8}+\frac{2}{8}$
$\frac{5}{6}x=\frac{5}{8}$
$x=\frac{5}{8}÷\frac{5}{6}$
$x=\frac{3}{4}$
解：$x÷3=4.6+5.6$
$x÷3=10.2$
$x=10.2×3$
$x=30.6$
$9x=1.8$
$x=1.8÷9$
$x=0.2$
解：$7x-5x=24$
$2x=24$
$x=24÷2$
$x=12$
解：$19-3x=1$
$3x=19-1$
$3x=18$
$x=18÷3$
$x=6$
解：$5x+\frac{1}{2}=\frac{7}{10}$
$5x=\frac{7}{10}-\frac{1}{2}$
$5x=\frac{7}{10}-\frac{5}{10}$
$5x=\frac{1}{5}$
$x=\frac{1}{5}÷5$
$x=\frac{1}{25}$
解：$1.2x=48$
$x=48÷1.2$
$x=40$
解：$\frac{2}{3}x-\frac{1}{6}x=\frac{1}{4}$
$\frac{4}{6}x-\frac{1}{6}x=\frac{1}{4}$
$\frac{1}{2}x=\frac{1}{4}$
$x=\frac{1}{4}÷\frac{1}{2}$
$x=\frac{1}{2}$
解：$x+\frac{3}{4}x=\frac{7}{8}$
$\frac{7}{4}x=\frac{7}{8}$
$x=\frac{7}{8}÷\frac{7}{4}$
$x=\frac{1}{2}$
解：$\frac{5}{6}x-\frac{1}{4}=\frac{3}{8}$
$\frac{5}{6}x=\frac{3}{8}+\frac{1}{4}$
$\frac{5}{6}x=\frac{3}{8}+\frac{2}{8}$
$\frac{5}{6}x=\frac{5}{8}$
$x=\frac{5}{8}÷\frac{5}{6}$
$x=\frac{3}{4}$
解：$x÷3=4.6+5.6$
$x÷3=10.2$
$x=10.2×3$
$x=30.6$
