考點(diǎn):分?jǐn)?shù)的四則混合運(yùn)算,運(yùn)算定律與簡(jiǎn)便運(yùn)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡(jiǎn)算
分析:(1)把125
化成125+
,再運(yùn)用乘法的分配律進(jìn)行簡(jiǎn)算;
(2)直接約分計(jì)算即可;
(3)直接約分計(jì)算即可;
(4)運(yùn)用乘法的分配律進(jìn)行簡(jiǎn)算;
(5)直接約分計(jì)算即可;
(6)先去括號(hào),再運(yùn)用乘法的交換律、結(jié)合律進(jìn)行簡(jiǎn)算.
解答:
解:(1)8×125
=8×(125+
)
=8×125+8×
=1000+6
=1006
;
(2)
3×26×
=
=3;
(3)
2×
2×16
=
=81;
(4)
3×
4+1.4×
3 =
3×(
4+1.4)
=
3×6
=
×=
=
;
(5)0.8×
2×
=
=
;
(6)125×(
1×
)×
=125×
×
1×
=(125×
)×(
1×
)
=
×1
=
.
點(diǎn)評(píng):此題考查了分?jǐn)?shù)的四則混合運(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.