分析:(1)先把3.2分解成8×0.4,再運用乘法結(jié)合律簡算;
(2)先把除法變成乘法,然后兩次運用乘法分配律簡算;
(3)先算小括號里面的乘法,再算小括號里面的減法,然后算中括號里面的除法,最后算括號外的除法;
(4)先算小括號里面的加法,再運用乘法分配律簡算;
(5)先運用乘法分配律計算中括號里面的運算,再算大括號里面的除法,然后算大括號里面的減法,最后再運用乘法分配律簡算.
解答:解:(1)
3×1.25×2×3.2,
=3
×(1.25×2.5×0.4×8),
=3
×[(1.25×8)×(2.5×0.4)],
=3
×(10×1),
=3
×10,
=
;
(2)
35×29+65×29-÷,
=35
×29+65
×29-
×29,
=(35
+65
-
)×29,
=101×29,
=(100+1)×29,
=100×29+1×29,
=2900+29,
=2929;
(3)0.03
÷[(14-2.25×)÷60%],
=0.03÷[(14-1.2)÷0.6],
=0.03÷[12.8÷0.6],
=0.03÷
,
=
;
(4)
2×0.65+2×0.35-(2+0.72)÷2,
=2
×0.65+2
×0.35-3.12÷2
,
=2
×(0.65+0.35)-3.12÷2
,
=2
×1-3.12÷2
,
=2
-1
,
=1
;
(5){[4-
(2-1)×3.5]
÷0.16-2}×
(2-1),
={[4-(
×3.5-
×3.5)]
÷0.16-2}×
(2-1),
={[4-(7.5-4.2)]
÷0.16-2}×
(2-1),
={[4-3.3]
÷0.16-2}×
(2-1),
={0.7
÷0.16-2}×
(2-1),
={
-
}×
(2-1),
=
×
(2-1),
=
×
-
×
,
=
-
,
=
.
點評:本題計算較復(fù)雜,要注意分析式中數(shù)據(jù),運用合適的簡便方法計算.