分析:(1)原式去括號(hào)后結(jié)合,計(jì)算即可得到結(jié)果;
(2)原式結(jié)合后,相加即可得到結(jié)果;
(3)原式利用減法法則變形,相加即可得到結(jié)果;
(4)原式結(jié)合后,利用加法法則計(jì)算即可得到結(jié)果;
(5)原式利用減法法則變形,相加即可得到結(jié)果;
(6)原式利用減法法則變形,計(jì)算即可得到結(jié)果;
(7)原式利用減法法則變形,結(jié)合后計(jì)算即可得到結(jié)果;
(8)原式利用減法法則及絕對(duì)值的代數(shù)意義化簡,計(jì)算即可得到結(jié)果;
(9)原式拆項(xiàng)后,抵消即可得到結(jié)果;
(10)原式拆項(xiàng)后,抵消即可得到結(jié)果.
解答:解:(1)原式=15+(-5
-2
)+(-3
-6
)
=15-8-10
=-3;
(2)原式=(-1.5-4.5)+(3.25+3.75)
=-6+7
=1;
(3)原式=(-5
-
)+(-
+1
)+5
=-6+1+6
=0;
(4)原式=(4
-3
)+(-1
-2
)+8
=1-4+8
=5;
(5)原式=(-3
+1
)+(2.75-1.75)
=-2+1
=-1;
(6)原式=(-4
-3
)+(5
-4
)
=-8+1
=-6
;
(7)原式=(-1
-2
)+(1
+3
-1
)
=-4+3
=-
;
(8)原式=-1.2+(2
+5
)-|-3.4+1.2|
=-1.2+8-2.2
=-4.6;
(9)原式=1-
+
-
+…+
-
=1-
=
;
(10)原式=
×(1-
+
-
+…+
-
)
=
×(1-
)
=
.
點(diǎn)評(píng):此題考查了有理數(shù)的加減混合運(yùn)算,熟練掌握運(yùn)算法則是解本題的關(guān)鍵.