题目内容
10.计算.(1)$\frac{4}{7}$×7÷$\frac{4}{7}$×7-(4$\frac{1}{3}$-3$\frac{1}{2}$)×48÷(2$\frac{3}{4}$-1.15);
(2)$\frac{10}{3}$÷2$\frac{19}{22}$-1$\frac{2}{5}$×$\frac{11}{13}$÷7+$\frac{1}{5}$×$\frac{22}{63}$.
分析 按照分数四则混合运算的顺序进行计算.
解答 解:(1)$\frac{4}{7}$×7÷$\frac{4}{7}$×7-(4$\frac{1}{3}$-3$\frac{1}{2}$)×48÷(2$\frac{3}{4}$-1.15)
=4÷$\frac{4}{7}$×7-$\frac{5}{6}$×48÷1.6
=7×7-40÷1.6
=49-25
=24;
(2)$\frac{10}{3}$÷2$\frac{19}{22}$-1$\frac{2}{5}$×$\frac{11}{13}$÷7+$\frac{1}{5}$×$\frac{22}{63}$
=1$\frac{31}{189}$-$\frac{77}{65}$÷7+$\frac{22}{315}$
=$\frac{220}{189}$-$\frac{11}{65}$+$\frac{22}{315}$
=$\frac{12221}{12285}$+$\frac{22}{315}$
=$\frac{13079}{12285}$.
点评 考查了分数四则混合运算,注意运算顺序和运算法则,然后再进一步计算.
练习册系列答案
相关题目
20.脱式计算(能简算的要用简便算法).
99×87+87 | 18.7-3.375-6.625 | 33.02-(148.4-90.85)÷2.5 |
[6.85-(0.75+0.2)]×1.5 | $\frac{4}{15}$÷[($\frac{5}{7}$-$\frac{3}{14}$)÷$\frac{3}{4}$] | $\frac{2}{5}$×($\frac{5}{6}$-0.75 )÷0.25 |