2.84×5.6+0.56+4.22×2.8递等式巧算？
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2.84ⅹ5.6+0.56+4.22ⅹ2.8
=2.84x5.6+0.1ⅹ5.6+2.11x5.6
=5.6x(2.84+0.1+2.11)
=5.6x5.05
=5.6x(5+0.05)
=28+0.28
=28.28。
=2.84x5.6+0.1ⅹ5.6+2.11x5.6
=5.6x(2.84+0.1+2.11)
=5.6x5.05
=5.6x(5+0.05)
=28+0.28
=28.28。
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