1 算一算。
(1) $7×11=$
(2) $56÷(8-2)=$
(3) $18÷6×3=$
(4) $20÷5×80=$
(5) $15×7-30=$
(6) $108+34÷17=$
(7) $\frac{20}{30}+\frac{10}{30}=$
(8) $\frac{17}{29}-\frac{5}{29}=$
(1) $7×11=$
(2) $56÷(8-2)=$
(3) $18÷6×3=$
(4) $20÷5×80=$
(5) $15×7-30=$
(6) $108+34÷17=$
(7) $\frac{20}{30}+\frac{10}{30}=$
(8) $\frac{17}{29}-\frac{5}{29}=$
答案
(1)77 (2)9……2 (3)9 (4)320 (5)75 (6)110 (7)1 (8)$\frac{12}{29}$
2 用递等式计算。(能简便计算的要用简便方法计算)
(1) $\frac{33}{99} + \frac{25}{99} - \frac{46}{99}$
(2) $\frac{7}{8} + \frac{2}{6} + \frac{1}{8} + \frac{4}{6}$
(3) $\frac{9}{12} - \frac{6}{7} + \frac{3}{12}$
(4) $1 - \frac{1}{2} - \frac{2}{4}$
(1) $\frac{33}{99} + \frac{25}{99} - \frac{46}{99}$
(2) $\frac{7}{8} + \frac{2}{6} + \frac{1}{8} + \frac{4}{6}$
(3) $\frac{9}{12} - \frac{6}{7} + \frac{3}{12}$
(4) $1 - \frac{1}{2} - \frac{2}{4}$
答案
(1)$\frac{12}{99}$ (2)2 (3)$\frac{1}{7}$ (4)0
(1)用分数表示阴影部分。
答案
(1) $\frac{1}{3}$ $\frac{2}{9}$ $\frac{1}{2}$ $\frac{2}{4}$
(2)把1米长的绳子平均分成10段,每一段都是1米的(
$\frac{1}{10}$
),是($\frac{1}{10}$
)米。答案
(2) $\frac{1}{10}$ $\frac{1}{10}$
(3) 10个△的$\frac{2}{5}$是(
4
)个△,(12
)个☆的$\frac{1}{3}$是4个☆。答案
(3) 4 12
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