下面各题怎样算简便就怎样算. 0.94×2.5-0.453.4×12.5×0.083.14×10217.68÷5.2+2.7×1.50.8×[13-(3.12+5.28)].
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下面各题怎样算简便就怎样算.
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(1)0.94×2.5-0.45,
=2.35-0.45,
=1.9;(2)3.4×12.5×0.08,
=3.4×(12.5×0.08),
=3.4×1,
=3.4;(3)3.14×102,
=3.14×(100+2),
=3.14×100+3.14×2,
=314+6.28
=320.28;(4)17.68÷5.2+2.7×1.5,
=3.4+4.05,
=7.45;(5)0.8×[13-(3.12+5.28)],
=0.8×[13-8.4].
=0.8×4.6,
=3.68.
