6.2X2.1-2.1Ⅹ2.8-2.8X0.15的简算? 15
2021-01-09
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6.2*2.1-2.1*2.8-2.8*0.15
=2.1*6.2-2.1*2.8-0.15*2*7*0.2
=2.1*6.2-2.1*2.8-2.1*0.2
=2.1*(6.2-2.8-0.2)
=2.1*3.2
=6.72
=2.1*6.2-2.1*2.8-0.15*2*7*0.2
=2.1*6.2-2.1*2.8-2.1*0.2
=2.1*(6.2-2.8-0.2)
=2.1*3.2
=6.72
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6.2X2.1-2.1Ⅹ2.8-2.8X0.15
=2.1(6.2-2.8)-2.8x0.15
=(21/10)(34/10)-(28/10)(1.5/10)
=(714/100)-(42/100)
=672/100
=6.72
=2.1(6.2-2.8)-2.8x0.15
=(21/10)(34/10)-(28/10)(1.5/10)
=(714/100)-(42/100)
=672/100
=6.72
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2021-01-09 · 知道合伙人教育行家
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6.2*2.1-2.1*2.8-2.8*0.15
=6.2*2.1-2.8*(2.1+0.15)
=6.2*2.1-2.8*2.25
=0.7*(6.2*3-4*2.25)
=0.7*(18.6-9)
=0.7*9.6
=6.72
=6.2*2.1-2.8*(2.1+0.15)
=6.2*2.1-2.8*2.25
=0.7*(6.2*3-4*2.25)
=0.7*(18.6-9)
=0.7*9.6
=6.72
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