能简便计算的要简便 ①35.7-8.9-11.1+3.3 ②4.6÷2.5÷0.4  ...
能简便计算的要简便①35.7-8.9-11.1+3.3②4.6÷2.5÷0.4③2.7×9.9④2.56×1.7+1.44×1.7⑤(1-0.2)×[13-(3.12+5...
能简便计算的要简便 ①35.7-8.9-11.1+3.3 ②4.6÷2.5÷0.4 ③2.7×9.9 ④2.56×1.7+1.44×1.7 ⑤(1-0.2)×[13-(3.12+5.28)].
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①35.7-8.9-11.1+3.3,
=35.7+3.3-(8.9+11.1),
=39-20,
=19;
②4.6÷2.5÷0.4,
=4.6÷(2.5×0.4),
=4.6÷1,
=4.6;
③2.7×9.9,
=2.7×(10-0.1),
=2.7×10-2.7×0.1,
=27-0.27,
=26.73;
④2.56×1.7+1.44×1.7,
=1.7×(2.56+1.44),
=1.7×4,
=6.8;
⑤(1-0.2)×[13-(3.12+5.28)],
=0.8×[13-8.4],
=0.8×4.6,
=3.68.
=35.7+3.3-(8.9+11.1),
=39-20,
=19;
②4.6÷2.5÷0.4,
=4.6÷(2.5×0.4),
=4.6÷1,
=4.6;
③2.7×9.9,
=2.7×(10-0.1),
=2.7×10-2.7×0.1,
=27-0.27,
=26.73;
④2.56×1.7+1.44×1.7,
=1.7×(2.56+1.44),
=1.7×4,
=6.8;
⑤(1-0.2)×[13-(3.12+5.28)],
=0.8×[13-8.4],
=0.8×4.6,
=3.68.
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