2.1×1.1×0.54÷(5.4×1.21÷
5
21
)=
1
22
1
22
分析:根據(jù)連除的性質(zhì),去掉括號(hào),然后再根據(jù)乘法交換律和結(jié)合律進(jìn)行計(jì)算即可.
解答:解:2.1×1.1×0.54÷(5.4×1.21÷
5
21
),
=2.1×1.1×0.54÷5.4÷1.21×
5
21
,
=(2.1×
5
21
)×(1.1÷1.21)×(0.54÷5.4),
=0.5×
10
11
×0.1,
=
1
2
×
10
11
×
1
10

=
1
22

故答案為:
1
22
點(diǎn)評(píng):四則運(yùn)算,先弄清運(yùn)算順序,然后再進(jìn)一步計(jì)算即可,能簡(jiǎn)算的要簡(jiǎn)算.
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