解:(1)-54×2
÷(-4
)×
=54×
×
×
=6;
(2)(
-
+
)×(-36)
=-18+20-21
=-19;
(3)-4×7-(-3)×6+5
=-28+18+5
=-5;
(4)-1-[1-(1-0.5×
)]×6
=-1-[1-(1-
×
)]×6
=-1-6+6-
×
×6
=-1-6+6-1
=-2;
(5)-2
2-(-3)
3×(-1)
4-(-1)
5
=-4+27×1+1
=-4+27+1
=24;
(6)
=-
×16-0.25×5×64
=-10-80
=-90;
(7)(-1)+(-1)
2+(-1)
3+…+(-1)
99+(-1)
100=-1+1-1+…-1+1
=0;
(8)
=
×(
-
)+
×(
-
)+
×(
-
)+…+
×(
-
)
=
×(
-
)
=
.
分析:(1)將除法轉(zhuǎn)化為乘法,約分化簡(jiǎn)計(jì)算即可;
(2)根據(jù)乘法分配律計(jì)算即可;
(3)先算乘法,再算加減法;
(4)去括號(hào)時(shí)根據(jù)乘法分配律計(jì)算;
(5)(6)先算乘方,再算乘法,再算加減法;
(7)相鄰兩個(gè)數(shù)的和為0;
(8)將式子變形為
×(
-
)+
×(
-
)+
×(
-
)+…+
×(
-
),兩兩抵消進(jìn)行計(jì)算.
點(diǎn)評(píng):考查了有理數(shù)混合運(yùn)算順序:
(1)先算乘方,再算乘除,最后算加減;同級(jí)運(yùn)算,應(yīng)按從左到右的順序進(jìn)行計(jì)算;如果有括號(hào),要先做括號(hào)內(nèi)的運(yùn)算.
(2)進(jìn)行有理數(shù)的混合運(yùn)算時(shí),注意各個(gè)運(yùn)算律的運(yùn)用,使運(yùn)算過(guò)程得到簡(jiǎn)化.