1. 下面各图中,能正确表示“$\frac{3}{4} × \frac{1}{2}$”的意义的是(

①②④
)。
答案:
①②④
2. 口算。
$2 × \frac{17}{90} = $
$\frac{3}{28} × \frac{7}{18} = $
$\frac{11}{15} × 1.5 = $
$\frac{5}{26} × 0.13 = $
$45 × \frac{2}{9} = $
$\frac{5}{18} × 0.6 = $
$\frac{7}{12} × 4.8 = $
$\frac{11}{13} × \frac{2}{11} = $
$\frac{4}{15} × \frac{5}{3} = $
$\frac{4}{5} × \frac{15}{16} = $
$\frac{3}{4} × 1.6 = $
$\frac{2}{3} × 0.6 = $
$\frac{9}{7} × 42 = $
$\frac{13}{48} × 0.96 = $
$2 × \frac{17}{90} = $
$\frac{17}{45}$
$\frac{3}{28} × \frac{7}{18} = $
$\frac{1}{24}$
$\frac{11}{15} × 1.5 = $
$1.1$
$\frac{5}{26} × 0.13 = $
$0.025$
$45 × \frac{2}{9} = $
$10$
$\frac{5}{18} × 0.6 = $
$\frac{1}{6}$
$\frac{7}{12} × 4.8 = $
$2.8$
$\frac{11}{13} × \frac{2}{11} = $
$\frac{2}{13}$
$\frac{4}{15} × \frac{5}{3} = $
$\frac{4}{9}$
$\frac{4}{5} × \frac{15}{16} = $
$\frac{3}{4}$
$\frac{3}{4} × 1.6 = $
$1.2$
$\frac{2}{3} × 0.6 = $
$0.4$
$\frac{9}{7} × 42 = $
$54$
$\frac{13}{48} × 0.96 = $
$0.26$
答案:
解析:本题考查分数与小数、整数之间的乘法运算。
答案:
$2×\frac{17}{90}=\frac{17}{45}$,
$\frac{3}{28}×\frac{7}{18}=\frac{1}{24}$,
$\frac{11}{15}×1.5 = 1.1$,
$\frac{5}{26}×0.13 = 0.025$,
$45×\frac{2}{9} = 10$,
$\frac{5}{18}×0.6=\frac{1}{6}$,
$\frac{7}{12}×4.8 = 2.8$,
$\frac{11}{13}×\frac{2}{11}=\frac{2}{13}$,
$\frac{4}{15}×\frac{5}{3}=\frac{4}{9}$,
$\frac{4}{5}×\frac{15}{16}=\frac{3}{4}$,
$\frac{3}{4}×1.6 = 1.2$,
$\frac{2}{3}×0.6 = 0.4$,
$\frac{9}{7}×42 = 54$,
$\frac{13}{48}×0.96 = 0.26$。
答案:
$2×\frac{17}{90}=\frac{17}{45}$,
$\frac{3}{28}×\frac{7}{18}=\frac{1}{24}$,
$\frac{11}{15}×1.5 = 1.1$,
$\frac{5}{26}×0.13 = 0.025$,
$45×\frac{2}{9} = 10$,
$\frac{5}{18}×0.6=\frac{1}{6}$,
$\frac{7}{12}×4.8 = 2.8$,
$\frac{11}{13}×\frac{2}{11}=\frac{2}{13}$,
$\frac{4}{15}×\frac{5}{3}=\frac{4}{9}$,
$\frac{4}{5}×\frac{15}{16}=\frac{3}{4}$,
$\frac{3}{4}×1.6 = 1.2$,
$\frac{2}{3}×0.6 = 0.4$,
$\frac{9}{7}×42 = 54$,
$\frac{13}{48}×0.96 = 0.26$。
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