下面各题怎样算简便就怎样算18.3-6.25-3.75+12.7 &nb...
下面各题怎样算简便就怎样算18.3-6.25-3.75+12.76.4×1012.5×6.78×0.473×1.8+8.2×73....
下面各题怎样算简便就怎样算18.3-6.25-3.75+12.7 6.4×101 2.5×6.78×0.4 73×1.8+8.2×73.
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(1)18.3-6.25-3.75+12.7
=(18.3+12.7)-(6.25+3.75)
=31-10
=21;
(2)6.4×101
=6.4×(100+1)
=6.4×100+6.4×1
=640+6.4
=646.4;
(3)2.5×6.78×0.4
=(2.5×0.4)×6.78
=1×6.78
=6.78;
(4)73×1.8+8.2×73
=73×(1.8+8.2)
=73×10
=730.
=(18.3+12.7)-(6.25+3.75)
=31-10
=21;
(2)6.4×101
=6.4×(100+1)
=6.4×100+6.4×1
=640+6.4
=646.4;
(3)2.5×6.78×0.4
=(2.5×0.4)×6.78
=1×6.78
=6.78;
(4)73×1.8+8.2×73
=73×(1.8+8.2)
=73×10
=730.
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