3.4*5.6 4.8*2.2的简便方法
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3.4x5.6+4.8x2.2
=3.4x7x0.8+0.8x6x2.2
=23.8x0.8+0.8x13.2
=(23.8+13.2)x0.8
=37x0.8
=30x0.8+7x0.8
=24+5.6
=29.6
或者
=（2.4x5.6+1x5.6)+2.4x2x2.2
=2.4x5.6+5.6+2.4x4.4
=2.4x(5.6+4.4)+5.6
=2.4x10+5.6
=24+5.6
=29.6
=3.4x7x0.8+0.8x6x2.2
=23.8x0.8+0.8x13.2
=(23.8+13.2)x0.8
=37x0.8
=30x0.8+7x0.8
=24+5.6
=29.6
或者
=（2.4x5.6+1x5.6)+2.4x2x2.2
=2.4x5.6+5.6+2.4x4.4
=2.4x(5.6+4.4)+5.6
=2.4x10+5.6
=24+5.6
=29.6
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