分析:(1)根據(jù)加法交換律與結(jié)合律,把同分母分?jǐn)?shù)相加減即可;
(2)先去小括號(hào),再去中括號(hào),然后利用加法交換律與結(jié)合律進(jìn)行計(jì)算即可得解;
(3)利用乘法分配律進(jìn)行計(jì)算即可得解;
(4)逆運(yùn)用乘法分配律進(jìn)行計(jì)算即可得解;
(5)把帶分?jǐn)?shù)化為假分?jǐn)?shù),再根據(jù)有理數(shù)混合運(yùn)算順序,先算括號(hào)里面的,再按照從左到右的順序把除法轉(zhuǎn)化為乘法,然后計(jì)算即可得解;
(6)根據(jù)有理數(shù)的混合運(yùn)算順序,先算乘方,再算乘除,最后算加減.
解答:解:(1)1-
+
-
+
=1-
-
+
+
=1-1+2
=2;
(2)-5
-[-1.5-(4.5-4
)]
=-5
-(-1.5-4.5+4
)
=-5
+1.5+4.5-4
=-10.5+6
=-4.5;
(3)-24×(-
+
-
)
=-
×(-24)+
×(-24)-
×(-24)
=12-18+8
=20-18
=2;
(4)18×(-
)+13×
-4×
=
×(-18+13-4)
=
×(-9)
=-6;
(5)-1
×(
-1)÷|-
|
=-
×(-
)×13
=13;
(6)-1
4÷(-5
2)×(-
)+|0.8-1|
=-1×(-
)×(-
)+0.2
=-
+
=
.
點(diǎn)評(píng):本題考查了有理數(shù)混合運(yùn)算的順序,先乘除后加減,有括號(hào)的先算括號(hào)里面的,計(jì)算過(guò)程中注意正負(fù)符號(hào)的變化,能利用運(yùn)算定律的利用運(yùn)算定律使運(yùn)算更加簡(jiǎn)便.