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28.9+28.9×99
=28.9×(1+99)
=28.9×100
=2890
5.23*0.7+4.23
=(4.23+1)×0.7+4.23
=4.23×0.7+0.7+4.23
=4.23×(0.7+1)+0.7
=7.191+0.7
=7.891
=28.9×(1+99)
=28.9×100
=2890
5.23*0.7+4.23
=(4.23+1)×0.7+4.23
=4.23×0.7+0.7+4.23
=4.23×(0.7+1)+0.7
=7.191+0.7
=7.891
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