巧算15.5×6.6 +22×6.35
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巧算15.5×6.6+22×6.35如下:
15.5×6.6+22×6.35
=15.5×3×2.2+2.2×10×6.35
=46.5×2.2+2.2×63.5
=2.2×(46.5+63.5)
=2.2×110
=242
15.5×6.6+22×6.35
=15.5×3×2.2+2.2×10×6.35
=46.5×2.2+2.2×63.5
=2.2×(46.5+63.5)
=2.2×110
=242
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