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2.6×0.7×0.8
=（2.5+0.1）×0.8×0.7
=2.5×0.8×0.7+0.1×0.8×0.7
=1.4+0.056
=1.456
=（2.5+0.1）×0.8×0.7
=2.5×0.8×0.7+0.1×0.8×0.7
=1.4+0.056
=1.456
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展开全部
39.3*7.2+26.8*2.8
=(12.5+26.8)x7.2+26.8x2.8
=12.5x7.2+26.8x7.2+26.8x2.8
=12.5x8x0.9+26.8x(7.2+2.8)
=100x0.9+26.8x10
=90+268
=358
=(12.5+26.8)x7.2+26.8x2.8
=12.5x7.2+26.8x7.2+26.8x2.8
=12.5x8x0.9+26.8x(7.2+2.8)
=100x0.9+26.8x10
=90+268
=358
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