2.9×13.7-3.7用简便方法怎么解?
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2.9×13.7-3.7
=(3-0.1)x13.7-3.7
=41.1-1.37-3.7
=41.1-5.07
=36.03
=(3-0.1)x13.7-3.7
=41.1-1.37-3.7
=41.1-5.07
=36.03
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2.9×13.7-3.7
=(3-0.1)x13.7-3.7
=3x13.7-0.1x13.7-3.7
=41.1-(1.37+3.7)
=41.1-5.07
=36.03
=(3-0.1)x13.7-3.7
=3x13.7-0.1x13.7-3.7
=41.1-(1.37+3.7)
=41.1-5.07
=36.03
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尽量好算一些吧
原式=2.9×10+2.9×3.7-3.7
=29+(2.9-1)×3.7
=29+(2-0.1)×3.7
=29+2×3.7-0.1×3.7
=29+7.4-0.37
=29+7+(0.4-0.37)
=36+0.03
=36.03
原式=2.9×10+2.9×3.7-3.7
=29+(2.9-1)×3.7
=29+(2-0.1)×3.7
=29+2×3.7-0.1×3.7
=29+7.4-0.37
=29+7+(0.4-0.37)
=36+0.03
=36.03
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