解:
①7968-2968÷28×27,
=7968-106×27,
=7968-2862,
=5106;
②5.47-3
![](http://thumb.zyjl.cn/pic5/latex/4442.png)
+3.63-2
![](http://thumb.zyjl.cn/pic5/latex/2766.png)
,
=(5.47+3.63)-(3
![](http://thumb.zyjl.cn/pic5/latex/4442.png)
+2
![](http://thumb.zyjl.cn/pic5/latex/2766.png)
),
=9-6,
=3;
③(8.8-23.4×
![](http://thumb.zyjl.cn/pic5/latex/8.png)
)÷
![](http://thumb.zyjl.cn/pic5/latex/4442.png)
,
=(8.8-7.8)÷
![](http://thumb.zyjl.cn/pic5/latex/4442.png)
,
=1÷
![](http://thumb.zyjl.cn/pic5/latex/4442.png)
,
=
![](http://thumb.zyjl.cn/pic5/latex/3086.png)
;
④
![](http://thumb.zyjl.cn/pic5/latex/179714.png)
,
=
![](http://thumb.zyjl.cn/pic5/latex/519713.png)
,
=
![](http://thumb.zyjl.cn/pic5/latex/519714.png)
,
=0.3×8,
=2.4;
⑤12.5×2.5×12×
![](http://thumb.zyjl.cn/pic5/latex/137.png)
,
=12.5×2.5×(4×8),
=(12.5×8)×(2.5×4),
=100×10,
=1000;
⑥[1.6-(
![](http://thumb.zyjl.cn/pic5/latex/179715.png)
)×
![](http://thumb.zyjl.cn/pic5/latex/1154.png)
]÷
![](http://thumb.zyjl.cn/pic5/latex/168.png)
,
=[1.6-
![](http://thumb.zyjl.cn/pic5/latex/8064.png)
×
![](http://thumb.zyjl.cn/pic5/latex/1154.png)
]÷
![](http://thumb.zyjl.cn/pic5/latex/168.png)
,
=[1.6-0.4]÷
![](http://thumb.zyjl.cn/pic5/latex/168.png)
,
=1.2÷
![](http://thumb.zyjl.cn/pic5/latex/168.png)
,
=1.8.
分析:①先算除法,再算乘法,最后算減法;
②根據(jù)加法交換律和結(jié)合律進(jìn)行計(jì)算;
③先算乘法,再算減法,最后算除法;
④根據(jù)乘法分配律進(jìn)行計(jì)算;
⑤根據(jù)乘法交換律和結(jié)合律進(jìn)行計(jì)算;
⑥先算小括號(hào)里面的減法,再算中括號(hào)里面的乘法,再算中括號(hào)里面的減法,最后算除法.
點(diǎn)評(píng):四則運(yùn)算,先弄清運(yùn)算順序,然后再進(jìn)行計(jì)算,能簡(jiǎn)算的要簡(jiǎn)算.