2.4×2.2-2.1×2.3简便方法
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2.4×2.2-2.1×2.3
=(2.3+0.1)×2.2-2.1×2.3
=2.3×2.2+0.1×2.2-2.1×2.3
=2.3×(2.2-2.1)+0.1×2.2
=2.3×0.1+0.1×2.2
=(2.3+2.2)×0.1
=4.5×0.1
=0.45
=(2.3+0.1)×2.2-2.1×2.3
=2.3×2.2+0.1×2.2-2.1×2.3
=2.3×(2.2-2.1)+0.1×2.2
=2.3×0.1+0.1×2.2
=(2.3+2.2)×0.1
=4.5×0.1
=0.45
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