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6.28×390+6.28×51+628×0.1
=6.28×390+6.28×51+6.28×10
=6.28×(390+51+10)
=6.28×(450+1)
=6.28×450+6.28
=2826+6.28
=2832.28
=6.28×390+6.28×51+6.28×10
=6.28×(390+51+10)
=6.28×(450+1)
=6.28×450+6.28
=2826+6.28
=2832.28
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展开全部
6.28×390+6.28×51+628×0.1简便运算
6.28×390+6.28×51+628×0.1
=6.28×390+6.28×51+6.28x10
=6.28X（390+51+10）
=6.28x451
=2832.28
6.28×390+6.28×51+628×0.1
=6.28×390+6.28×51+6.28x10
=6.28X（390+51+10）
=6.28x451
=2832.28
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=6.28x390+6.28x51+6.28x0.001
=6.28x(390+51+0.001)
=6.28x441.001
=2,763.20628
=6.28x(390+51+0.001)
=6.28x441.001
=2,763.20628
追答
=6.28×390+6.28×51+6.28x10
=6.28X（390+51+10）
=6.28x451
=2832.28
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