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1. 直接写出得数。
$0.5+\dfrac{1}{2}=$
$\dfrac{3}{8}+\dfrac{1}{8}=$
$\dfrac{5}{16}-\dfrac{1}{8}=$
$\dfrac{1}{3}+\dfrac{1}{6}=$
$\dfrac{1}{5}+\dfrac{1}{4}=$
$0.75-\dfrac{1}{2}=$
$1-\dfrac{10}{11}=$
$\dfrac{3}{8}+\dfrac{5}{16}=$
$1-\dfrac{1}{4}+\dfrac{3}{4}=$
$0.5+\dfrac{1}{2}=$
$\dfrac{3}{8}+\dfrac{1}{8}=$
$\dfrac{5}{16}-\dfrac{1}{8}=$
$\dfrac{1}{3}+\dfrac{1}{6}=$
$\dfrac{1}{5}+\dfrac{1}{4}=$
$0.75-\dfrac{1}{2}=$
$1-\dfrac{10}{11}=$
$\dfrac{3}{8}+\dfrac{5}{16}=$
$1-\dfrac{1}{4}+\dfrac{3}{4}=$
答案
1.1 $\dfrac{1}{2}$ $\dfrac{3}{16}$ $\dfrac{1}{2}$ $\dfrac{9}{20}$ 0.25 $\dfrac{1}{11}$ $\dfrac{11}{16}$ $\dfrac{3}{2}$
2. 解方程。
$\frac{3}{4} - 2x = \frac{5}{16}$
$2.8x - 1.9x = 13.5$
$5x - 1.3 × 7 = 12.5$
$\frac{3}{4} - 2x = \frac{5}{16}$
$2.8x - 1.9x = 13.5$
$5x - 1.3 × 7 = 12.5$
答案
2.$x=\dfrac{7}{32}$ $x=15$ $x=4.32$
3. 怎样简便就怎样算。
$\frac{4}{9} - \frac{5}{12} + \frac{5}{9} - \frac{1}{12}$
$\frac{11}{6} - (\frac{5}{6} + \frac{3}{8})$
$6.12 + \frac{3}{7} + 2.88 + \frac{4}{7}$
$\frac{8}{11} - (\frac{5}{11} - \frac{3}{8})$
$0.3 × 2.5 × 0.4$
$56 × 1.25$
$\frac{4}{9} - \frac{5}{12} + \frac{5}{9} - \frac{1}{12}$
$\frac{11}{6} - (\frac{5}{6} + \frac{3}{8})$
$6.12 + \frac{3}{7} + 2.88 + \frac{4}{7}$
$\frac{8}{11} - (\frac{5}{11} - \frac{3}{8})$
$0.3 × 2.5 × 0.4$
$56 × 1.25$
答案
3.$\dfrac{1}{2}$ $\dfrac{5}{8}$ 10 $\dfrac{57}{88}$ 0.3 70
4. 求出下面各组数的最大公因数和最小公倍数。
35 和 60
24 和 48
72 和 5
35 和 60
24 和 48
72 和 5
答案
4.5 420 24 48 1 360
