2.7×13-8.9-2.9的简便计算。
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2.7×13-8.9-2.9
=2.7x13-(8.9+2.9)
=2.7x13-11.8
=2.7x13-13+1.2
=(2.7-1)x13+1.2
=1.7x13+1.2
=(1.2+0.5)x13+1.2
=1.2x14+1.3x5
=1.2x14+(1.2+0.1)x5
=1.2x19+0.5
=1.2x20-1.2+0.5
=24-0.7
=23.3
=2.7x13-(8.9+2.9)
=2.7x13-11.8
=2.7x13-13+1.2
=(2.7-1)x13+1.2
=1.7x13+1.2
=(1.2+0.5)x13+1.2
=1.2x14+1.3x5
=1.2x14+(1.2+0.1)x5
=1.2x19+0.5
=1.2x20-1.2+0.5
=24-0.7
=23.3
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