分析:(1)先去括號(hào),再把同分母的相加,再從左向右計(jì)算即可;
(2)先去括號(hào),再把互為相反數(shù)的數(shù)相加,再從左向右計(jì)算即可;
(3)化小數(shù)為分?jǐn)?shù),把除法轉(zhuǎn)化成乘法,約分即可;
(4)利用乘法分配律計(jì)算;
(5)先乘方,再算乘除,最后算加減,有括號(hào)的先算括號(hào)里的;
(6)先算乘方,再算乘除,最后算加減;
(7)先算乘方,再算乘除,最后算加減,有括號(hào)的先算括號(hào)里的;
(8)根據(jù)絕對(duì)值的定義,結(jié)合|a-b|=|b-a|進(jìn)行計(jì)算即可.
解答:解:(1)原式=-7
-2
-4
+1
+3
=-10-
=-10
;
(2)原式=-
-
+1
+
-2+
=-
;
(3)原式=-
×
×
×
×
=-
;
(4)原式=(-13
-5
)×
+(-196
+76
)×
=-
;
(5)原式=-4×
-
×42-
×42+
×42=-19
;
(6)原式=-9×4×
×(-4)+
-
=1600+
-
=1599
;
(7)原式=100-[-9-25×(-
)×2]=100-21=79;
(8)原式=
-
-
+
+
-
=
.
點(diǎn)評(píng):本題考查了有理數(shù)的混合運(yùn)算,解題的關(guān)鍵是注意運(yùn)算順序.