3.9×5.6 0.61×44用简便运算
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3.9×5.6+0.61×44
=3.9x5.6+6.1x4.4
=3.9x5.6+6.1x(5.6-1.2)
=3.9x5.6+6.1x5.6-6.1x1.2
=5.6x(3.9+6.1)-(6+0.1)x1.2
=5.6x10-6x1.2-0.1x1.2
=56-7.2-0.12
=48.8-0.12
=48.68
=3.9x5.6+6.1x4.4
=3.9x5.6+6.1x(5.6-1.2)
=3.9x5.6+6.1x5.6-6.1x1.2
=5.6x(3.9+6.1)-(6+0.1)x1.2
=5.6x10-6x1.2-0.1x1.2
=56-7.2-0.12
=48.8-0.12
=48.68
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