(2.5÷2+2÷2.5)x 0.4简便
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2016-10-21
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(2.5÷2+2÷2.5)x 0.4
=(5/2 ÷ 2 +2 ÷ 5/2 )*2/5
=(5/2 * 1/2 +2 * 2/5)*2/5
=(5/4 + 4/5)*2/5
=41/20 * 2/5
=82/100=0.82
=(5/2 ÷ 2 +2 ÷ 5/2 )*2/5
=(5/2 * 1/2 +2 * 2/5)*2/5
=(5/4 + 4/5)*2/5
=41/20 * 2/5
=82/100=0.82
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