分析:(1)根據(jù)數(shù)字特點(diǎn),運(yùn)用加法交換律與結(jié)合律以及減法的性質(zhì)簡(jiǎn)算;
(2)(5)運(yùn)用乘法分配律簡(jiǎn)算;
(3)中括號(hào)內(nèi)運(yùn)用乘法分配律簡(jiǎn)算,然后算括號(hào)外的除法;
(4)括號(hào)內(nèi)運(yùn)用乘法分配律簡(jiǎn)算,然后算括號(hào)外的除法;
(6)中括號(hào)內(nèi)運(yùn)用減法的性質(zhì)簡(jiǎn)算,然后算括號(hào)外的乘法.
解答:解:(1)
61-15.37+
38-34.63,
=(
61+
38)-(15.37+34.63),
=100-50,
=50;
(2)24×(
+
-
),
=24×
+24×
-24×
,
=9+20-18,
=11;
(3)360÷[56×(
-
)],
=360÷[56×
-56×
],
=360÷[24-21],
=360÷3,
=120;
(4)(
×1.7+
×1.7)÷
,
=(
+
)×1.7×
,
=1×
×
,
=
;
(5)80.7×8.7+8.07×13,
=8.07×87+8.07×13,
=8.07×(87+13),
=8.07×100,
=807;
(6)
×[
-(
-
)],
=
×[
-
+
],
=
×[1-
],
=
×
,
=
.
點(diǎn)評(píng):此題是考查四則混合運(yùn)算,要仔細(xì)觀察算式的特點(diǎn),靈活運(yùn)用一些定律進(jìn)行簡(jiǎn)便計(jì)算.