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解:
3.14×1.9+31.4×0.18
=3.14×1.9+3.14×1.8
=3.14(1.9+1.8)
=3.14×3.7
=11.618
3.14×1.9+31.4×0.18
=3.14×1.9+3.14×1.8
=3.14(1.9+1.8)
=3.14×3.7
=11.618
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=3.14×1.9+3.14×10×0.18
=3.14×(1.9+1.8)
=3.14×3.7
=11.618
=3.14×(1.9+1.8)
=3.14×3.7
=11.618
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展开全部
3.14x1.9+31.4x0.18
=3.14*1.9+3.14*10*0.18
=3.14*(1.9+10*0.18)
=3.14*(1.9+1.8)
=3.14*3.7
=3.14*(4-0.3)
=3.14*4-3.14*0.3
=12.56-0.942
=11.618
=3.14*1.9+3.14*10*0.18
=3.14*(1.9+10*0.18)
=3.14*(1.9+1.8)
=3.14*3.7
=3.14*(4-0.3)
=3.14*4-3.14*0.3
=12.56-0.942
=11.618
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