考點(diǎn):有理數(shù)的混合運(yùn)算
專題:
分析:(1)按運(yùn)算順序進(jìn)行計(jì)算即可;
(2)按運(yùn)算順序進(jìn)行計(jì)算即可;
(3)按運(yùn)算順序進(jìn)行計(jì)算即可;
(4)按運(yùn)算順序進(jìn)行計(jì)算即可;
(5)根據(jù)乘法的分配律進(jìn)行計(jì)算即可;
(6)根據(jù)乘法的分配律以及運(yùn)算順序進(jìn)行計(jì)算即可;
(7)先算乘方,再算乘除,最后算加減即可.
解答:解:(1)原式=-1-
×(2-9)
=-1+
=
;
(2)原式=1-
×
×(-2)
=1+
=1
;
(3)原式=-
+
-8+
×
=-8+
=-6
;
(4)原式=-8-3×18+9×
=-8-54+4.5
=-57.5;
(5)原式=-24×
-24×
+24×
=-33-56+18
=-71,
(6)原式=
×18-
×18+
×18+6×(3.95-1.45)
=14-15+5+15
=19;
(7)原式=(
×4)
2×4-
+1+
=4+(-3)
=1.
點(diǎn)評(píng):本題考查了有理數(shù)的混合運(yùn)算,是基礎(chǔ)題比較簡(jiǎn)單.