解:(1)762-408÷4×5,
=762-102×5,
=762-510,
=252;
(2)35×
+
×14,
=10+10,
=20;
(3)1.5×[0.02÷(2.1-2.09)],
=1.5×[0.02÷0.01],
=1.5×2,
=3;
(4)12.5×8.8,
=12.5×(8+0.8),
=12.5×8+12.5×0.8,
=100+10,
=110;
(5)87.58-(7.58+3.8),
=87.58-7.58-3.8,
=80-3.8,
=76.2;
(6)(
+
)×4+
,
=
×4+
×4+
,
=
+
+
,
=
+(
+
),
═
+1,
=1
.
分析:(1)先算除法,再算乘法,最后算減法,
(2)先同時(shí)求出兩個(gè)乘法算式的積,再算加法,
(3)先算小括號(hào)里的減法,再算中括號(hào)里的除法,最后算括號(hào)外的乘法,
(4)把8.8化成8+0.8,運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算,
(5)先去括號(hào),再?gòu)淖笙蛴疫M(jìn)行計(jì)算即可,
(6)先運(yùn)用乘法的分配律進(jìn)行簡(jiǎn)算,
點(diǎn)評(píng):考查了整數(shù)、分?jǐn)?shù)四則混合運(yùn)算的順序,注意靈活運(yùn)用運(yùn)算定律進(jìn)行簡(jiǎn)算.