数学简算? 30
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(5/8-3/4+1/2)*2.4
=(5/8-6/8+4/8)*2.4
=3/8*2.4
=24/8*3/10
=3*3/10
=0.9
=(5/8-6/8+4/8)*2.4
=3/8*2.4
=24/8*3/10
=3*3/10
=0.9
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9999*7778+3333*6666
=9999*7778+9999*2222
=9999*(7778+2222)
=9999*10000
=99990000
5.6*69.32+138.64*0.05+693.2*0.43
=5.6*69.32+69.32+69.32*4.3
=69.32*(5.6+1+3.4)
=69.32*10
=693.2
1234567891^2-1234567890*1234567892
=1234567891^2-(1234567891-1)*(1234567891+1)
=1234567891^2-1234567891^2+1
=1
=9999*7778+9999*2222
=9999*(7778+2222)
=9999*10000
=99990000
5.6*69.32+138.64*0.05+693.2*0.43
=5.6*69.32+69.32+69.32*4.3
=69.32*(5.6+1+3.4)
=69.32*10
=693.2
1234567891^2-1234567890*1234567892
=1234567891^2-(1234567891-1)*(1234567891+1)
=1234567891^2-1234567891^2+1
=1
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(5/8-3/4+1/2)x2.4
=5/8ⅹ2.4-3/4ⅹ2.4+1/2x2.4
=1.5-1.8+1.2
=0.9
=5/8ⅹ2.4-3/4ⅹ2.4+1/2x2.4
=1.5-1.8+1.2
=0.9
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