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简便方法计算:6.49×0.22+258×0.0649+5.3×6.49+64.9×0.19.
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简便方法计算:6.49×0.22+258×0.0649+5.3×6.49+64.9×0.19.
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6.49×0.22+258×0.0649+5.3×6.49+64.9×0.19
=6.49×0.22+2.58×6.49+5.3×6.49+6.49×1.9
=6.49×(0.22+2.58+5.3+1.9)
=6.49×10
=64.9
=6.49×0.22+2.58×6.49+5.3×6.49+6.49×1.9
=6.49×(0.22+2.58+5.3+1.9)
=6.49×10
=64.9
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