题目内容
7.用竖式计算并验算.144038÷18 | 5+5×6-$\frac{1}{6}$×35 | ($\frac{1}{3}$+$\frac{5}{7}$×1$\frac{2}{5}$)÷[(4-2$\frac{2}{3}$)×3] |
6.3×[(14+$\frac{1}{3}$)÷1.12-1$\frac{1}{6}$] | 0.7÷7+0×5.8-5.8÷200 | (1$\frac{8}{17}$×$\frac{17}{50}$+8$\frac{1}{3}$÷1$\frac{11}{39}$)÷9$\frac{1}{3}$ |
分析 (1)根据分数除法的计算方法进行计算;
(2)先算乘法,再按照从左向右的顺序进行计算;
(3)先算小括号里面的乘法和减法,再算小括号里面的加法和中括号里面的乘法,最后算除法;
(4)先算加法,再算除法,再算减法,最后算乘法;
(5)先算除法和乘法,再按照从左向右的顺序进行计算;
(6)先算小括号里面的乘法和除法,最后算括号外面的除法.
解答 解:(1)144038÷18=8002$\frac{1}{9}$;
(2)5+5×6-$\frac{1}{6}$×35
=5+30-5$\frac{5}{6}$
=35-5$\frac{5}{6}$
=29$\frac{1}{6}$;
(3)($\frac{1}{3}$+$\frac{5}{7}$×1$\frac{2}{5}$)÷[(4-2$\frac{2}{3}$)×3]
=($\frac{1}{3}$+1)÷[1$\frac{1}{3}$×3]
=$\frac{4}{3}$÷4
=$\frac{1}{3}$;
(4)6.3×[(14+$\frac{1}{3}$)÷1.12-1$\frac{1}{6}$]
=6.3×[14$\frac{1}{3}$÷1.12-1$\frac{1}{6}$]
=6.3×[12$\frac{67}{84}$-1$\frac{1}{6}$]
=6.3×11$\frac{53}{84}$
=73.275;
(5)0.7÷7+0×5.8-5.8÷200
=0.1+0-0.029
=0.071;
(6)(1$\frac{8}{17}$×$\frac{17}{50}$+8$\frac{1}{3}$÷1$\frac{11}{39}$)÷9$\frac{1}{3}$
=($\frac{1}{2}$+$\frac{13}{2}$)÷9$\frac{1}{3}$
=7÷9$\frac{1}{3}$
=$\frac{3}{4}$.
点评 考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
A. | 20% | B. | 120% | C. | 80% |