1.次の計算をしなさい。
(1)\[(+3)+(+9)\]
\[+12\]
(2)\[(-5)+(-7)\]
\[-12\]
(3)\[(+8)+(-4)\]
\[+4\]
(4)\[(-12)+(+6)\]
\[-6\]
(5)\[(+6)+0\]
\[+6\]
(6)\[(-6.3)+(+3.3)\]
\[-3\]
(7)\[(-3.4)+(+1.8)\]
\[-1.6\]
(8)\[(+4.6)+(-4.6)\]
\[0\]
(9)\[\left(+\frac{4}{5}\right)+\left(-\frac{2}{5}\right)\]
\[+\frac{2}{5}\]
(10)\[(-4)+(+9)+(-16)\]
\[-11\]
(11)\[(+7)+(-6)+(+10)+(-5)\]
\[+6\]
(12)\[(-10)+(+13)+(+17)+(-20)\]
\[0\]
(13)\[(-9)+(+5)\]
\[-4\]
(14)\[(+2)+(+6)\]
\[+8\]
(15)\[(-1.5)+(-3)\]
\[-4.5\]
(16)\[\left(+\frac{1}{3}\right)+\left(-\frac{3}{4}\right)\]
\[-\frac{5}{12}\]
(17)\[(-15)+0\]
\[-15\]
(18)\[(+4)+(-2)+(-13)\]
\[-11\]
(19)\[(+9)-(+2)\]
\[+7\]
(20)\[(+4)-(-5)\]
\[+9\]
(21)\[(-4)-(+11)\]
\[-15\]
(22)\[(-1)-(-7)\]
\[+6\]
(23)\[0-(+9)\]
\[-9\]
(24)\[(-6)-(-6)\]
\[0\]
(25)\[(-13)-(+27)\]
\[-40\]
(26)\[(+14)-(+18)\]
\[-4\]
(27)\[(-16)-(-20)\]
\[+4\]
(28)\[(+7)-(-15)\]
\[+22\]
(29)\[(-15)-0\]
\[-15\]
(30)\[(+7.2)-(-3.5)\]
\[+10.7\]
(31)\[(-2.3)-(-2.3)\]
\[0\]
(32)\[\left(-\frac{2}{3}\right)-\left(-\frac{5}{6}\right)\]
\[+\frac{1}{6}\]
(33)\[-7+3-6\]
\[-10\]
(34)\[-8+5\]
\[-3\]
(35)\[6-8+7\]
\[+5\]
(36)\[-2+9-10\]
\[-3\]
(37)\[-11-4-1\]
\[-16\]
(38)\[7+(-13)-(-6)\]
\[0\]
(39)\[-5-(-7)+8\]
\[+10\]
(40)\[20-(-3)-2+(-7)\]
\[+14\]
(41)\[-27-(-5)-(+7)-10\]
\[-39\]
(42)\[(+3)+(+15)\]
\[+18\]
(43)\[(+9)+(-4)\]
\[+5\]
(44)\[(+6)+(-12)\]
\[-6\]
(45)\[(-7)+(-8)\]
\[-15\]
(46)\[(-16)+(+16)\]
\[0\]
(47)\[0+(-12)\]
\[-12\]
(48)\[(-1.3)+(+4.6)\]
\[+3.3\]
(49)\[\left(-\frac{2}{7}\right)+\left(-\frac{9}{7}\right)\]
\[-\frac{11}{7}\]
(50)\[(+2)-(-6)\]
\[+8\]
(51)\[(-3)-(-8)\]
\[+5\]
(52)\[(+4)-(+15)\]
\[-11\]
(53)\[(-5)-(+7)\]
\[-12\]
(54)\[(-14)-(-14)\]
\[0\]
(55)\[0-(-9)\]
\[+9\]
(56)\[(+0.6)-(-4.2)\]
\[+4.8\]
(57)\[\left(+\frac{2}{3}\right)-\left(-\frac{2}{9}\right)\]
\[+\frac{8}{9}\]
(58)\[(+8)-(+3)+(-10)\]
\[-5\]
(59)\[(-2)-(-4)-(+6)\]
\[-4\]
(60)\[7-9-12\]
\[-14\]
(61)\[-8+11-1+9\]
\[+11\]
(62)\[11-(-3)+5-4\]
\[+15\]
(63)\[-9-2+6+(-2)\]
\[-7\]
(64)\[-1.3+0.9-(-8.1)+1\]
\[8.7\]
(65)\[-\frac{3}{2}-\frac{1}{2}-\left(-\frac{2}{3}\right)+\frac{5}{3}\]
\[+\frac{1}{3}\]