6.28x7.2+0.28x62.8= 简便
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6.28×7.2+0.28×62.8
=6.28×7.2+0.28×10×6.28
=6.28×7.2+2.8×6.28
=6.28×（7.2+2.8）枣指轿凳肆逗弯
=6.28×10
=62.8
=6.28×7.2+0.28×10×6.28
=6.28×7.2+2.8×6.28
=6.28×（7.2+2.8）枣指轿凳肆逗弯
=6.28×10
=62.8
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