题目
计算:(1)-4.2+5.7-8.4+10;(2)-(1)/(4)+(5)/(6)+(2)/(3)-(1)/(2);(3)12-(-18)+(-7)-15;(4)4.7-(-8.9)-7.5+(-6);(5)(-4(7)/(8))-(-5(1)/(2))+(-4(1)/(4))-(+3(1)/(8));(6)(-(2)/(3))+|(0-5(1)/(6));)|+(-9(1)/(3)).
计算:
(1)-4.2+5.7-8.4+10;
(2)-$\frac{1}{4}$+$\frac{5}{6}$+$\frac{2}{3}$-$\frac{1}{2}$;
(3)12-(-18)+(-7)-15;
(4)4.7-(-8.9)-7.5+(-6);
(5)$(-4\frac{7}{8})-(-5\frac{1}{2})+(-4\frac{1}{4})-(+3\frac{1}{8})$;
(6)$(-\frac{2}{3})+|\begin{array}{l}{0-5\frac{1}{6}}\\{\;}\end{array}|$+$|\begin{array}{l}{-4\frac{5}{6}}\\{\;}\end{array}|$+$(-9\frac{1}{3})$.
(1)-4.2+5.7-8.4+10;
(2)-$\frac{1}{4}$+$\frac{5}{6}$+$\frac{2}{3}$-$\frac{1}{2}$;
(3)12-(-18)+(-7)-15;
(4)4.7-(-8.9)-7.5+(-6);
(5)$(-4\frac{7}{8})-(-5\frac{1}{2})+(-4\frac{1}{4})-(+3\frac{1}{8})$;
(6)$(-\frac{2}{3})+|\begin{array}{l}{0-5\frac{1}{6}}\\{\;}\end{array}|$+$|\begin{array}{l}{-4\frac{5}{6}}\\{\;}\end{array}|$+$(-9\frac{1}{3})$.
题目解答
答案
解:(1)-4.2+5.7-8.4+10
=(-4.2-8.4)+(5.7+10)
=-12.6+15.7
=3.1;
(2)-$\frac{1}{4}$+$\frac{5}{6}$+$\frac{2}{3}$-$\frac{1}{2}$
=-$\frac{3}{12}$+$\frac{10}{12}$+$\frac{8}{12}$-$\frac{6}{12}$
=$\frac{3}{4}$;
(3)12-(-18)+(-7)-15
=12+18-7-15
=30-22
=8;
(4)4.7-(-8.9)-7.5+(-6)
=4.7+8.9-7.5-6
=13.6-13.5
=0.1;
(5)$(-4\frac{7}{8})-(-5\frac{1}{2})+(-4\frac{1}{4})-(+3\frac{1}{8})$
=(-4$\frac{7}{8}$-3$\frac{1}{8}$)+(5$\frac{1}{2}$-4$\frac{1}{4}$)
=-8+1$\frac{1}{4}$
=-6$\frac{3}{4}$;
(6)$(-\frac{2}{3})+|\begin{array}{l}{0-5\frac{1}{6}}\\{\;}\end{array}|$+$|\begin{array}{l}{-4\frac{5}{6}}\\{\;}\end{array}|$+$(-9\frac{1}{3})$
=(-$\frac{2}{3}$-9$\frac{1}{3}$)+(5$\frac{1}{6}$+4$\frac{5}{6}$)
=-10+10
=0.
=(-4.2-8.4)+(5.7+10)
=-12.6+15.7
=3.1;
(2)-$\frac{1}{4}$+$\frac{5}{6}$+$\frac{2}{3}$-$\frac{1}{2}$
=-$\frac{3}{12}$+$\frac{10}{12}$+$\frac{8}{12}$-$\frac{6}{12}$
=$\frac{3}{4}$;
(3)12-(-18)+(-7)-15
=12+18-7-15
=30-22
=8;
(4)4.7-(-8.9)-7.5+(-6)
=4.7+8.9-7.5-6
=13.6-13.5
=0.1;
(5)$(-4\frac{7}{8})-(-5\frac{1}{2})+(-4\frac{1}{4})-(+3\frac{1}{8})$
=(-4$\frac{7}{8}$-3$\frac{1}{8}$)+(5$\frac{1}{2}$-4$\frac{1}{4}$)
=-8+1$\frac{1}{4}$
=-6$\frac{3}{4}$;
(6)$(-\frac{2}{3})+|\begin{array}{l}{0-5\frac{1}{6}}\\{\;}\end{array}|$+$|\begin{array}{l}{-4\frac{5}{6}}\\{\;}\end{array}|$+$(-9\frac{1}{3})$
=(-$\frac{2}{3}$-9$\frac{1}{3}$)+(5$\frac{1}{6}$+4$\frac{5}{6}$)
=-10+10
=0.