8.9×1.1×4.7减算?
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8.9×1.1×4.7
=8.9×(1+1)×4.7
=8.9×(4.7×1)+(4.7×0.1)
=8.9×(4.7+0.47)
=8.9×5.17
=(9-0.1)×5.17
=9×5.17-0.1×5.17
=46.013
=8.9×(1+1)×4.7
=8.9×(4.7×1)+(4.7×0.1)
=8.9×(4.7+0.47)
=8.9×5.17
=(9-0.1)×5.17
=9×5.17-0.1×5.17
=46.013
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