分析:(1)根據(jù)異號(hào)兩數(shù)的加法法則即可求解;
(2)首先利用減法法則,減去一個(gè)數(shù)等于加上這個(gè)數(shù)的相反數(shù),即可轉(zhuǎn)化為加法,從而求解;
(3)根據(jù)同號(hào)兩個(gè)的加法法則求解;
(4)根據(jù)乘法法則,首先確定符號(hào),然后確定絕對值;
(5)根據(jù)乘方的意義即可求解;
(6)根據(jù)除法法則,首先確定符號(hào),然后確定絕對值即可;
(7)根據(jù)任何數(shù)與0的乘積是0即可求解;
(8)根據(jù)乘法法則,首先確定符號(hào),然后確定絕對值;
(9)首先去掉絕對值符號(hào),然后進(jìn)行減法運(yùn)算.
解答:解:(1)原式=-5;
(2)原式=15+3=18;
(3)原式=-(8+6)=-14;
(4)原式=
;
(5)原式=-25;
(6)原式=-
×
=-
;
(7)原式=0;
(8)原式=1.2×
=0.12;
(9)原式=7-5=2.
點(diǎn)評:本題考查了有理數(shù)的計(jì)算法則,在進(jìn)行計(jì)算時(shí)首先要確定符號(hào),然后確定絕對值.