7.81×1.45+3.14×2.19+1.69×7.81的简便计算方法?
展开全部
=7.81x(1.45+1.69)+3.14x2.19
=7.81x3.14+3.14x2.19
=(7.81+2.19)x3.14
=10x3.14
=31.4
=7.81x3.14+3.14x2.19
=(7.81+2.19)x3.14
=10x3.14
=31.4
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展开全部
=7.81x(1.45+1.69)+3.14x2.19
=7.81x3.14+3.14x2.19
=(7.81+2.19)x3.14
=10x3.14
=31.4
=7.81x3.14+3.14x2.19
=(7.81+2.19)x3.14
=10x3.14
=31.4
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展开全部
=7.81*(1.45+1.69)+3.14*2.19
=3.14*(7.81+2.19)
=3.14*10
=31.4
=3.14*(7.81+2.19)
=3.14*10
=31.4
追答
=7.81*(1.45+1.69)+3.14*2.19
=3.14*(7.81+2.19)
=3.14*10
=31.4
=7.81*(1.45+1.69)+3.14*2.19
=3.14*(7.81+2.19)
=3.14*10
=31.4
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你对这个回答的评价是?
展开全部
=7.81*(1.45+1.69)+3.14*2.19
=3.14*(7.81+2.19)
=3.14*10
=31.4
=3.14*(7.81+2.19)
=3.14*10
=31.4
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你对这个回答的评价是?
展开全部
7.81×1.45+3.14×2.19+1.69×7.81
=7.81×(1.45+1.69)+3.14×2.19
=7.81×3.14+3.14×2.19
=(7.81+2.19)×3.14
=10×3.14
=31.4
=7.81×(1.45+1.69)+3.14×2.19
=7.81×3.14+3.14×2.19
=(7.81+2.19)×3.14
=10×3.14
=31.4
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你对这个回答的评价是?
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