解:①[(
-
)+(
-
)]÷
,
=[(
-
+
-
)]÷
,
=[(
+
)-(
+
)]÷
,
=[1-1]÷
,
=0÷
,
=0;
②34×(
+
)×13,
=34×13×
+
×34×13
=26+34,
=60;
③2000÷12.5÷25÷0.8÷4,
=2000÷[(12.5×0.8)×(25×4)],
=2000÷[10×100],
=2000÷1000,
=2;
④[(
-
)×
]÷
,
=[
×
]÷
,
=
×
,
=
;
⑤
×
+
÷
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
⑥(
+
)÷(
÷4-
),
=
÷(
×
-
),
=
÷(
-
),
=
÷
,
=
×10,
=7
.
分析:①中括號(hào)內(nèi)運(yùn)用加法交換律與結(jié)合律簡(jiǎn)算,結(jié)果為0,因此算式等于0;
②運(yùn)用乘法分配律簡(jiǎn)算;
③運(yùn)用除法的性質(zhì)簡(jiǎn)算;
④先算小括號(hào)內(nèi)的,再算中括號(hào)內(nèi)的,最后算括號(hào)外的;
⑤把除法改為乘法,運(yùn)用乘法分配律簡(jiǎn)算;
⑥兩個(gè)括號(hào)同時(shí)計(jì)算,最后算除法.
點(diǎn)評(píng):考查了四則混合運(yùn)算,注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律或性質(zhì)進(jìn)行簡(jiǎn)便計(jì)算.