72×39+72怎样简便运算?要用梯等式!

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72×39+72怎样简便运算?要用梯等式!72×39+72怎样简便运算?要用梯等式!72×39+72怎样简便运算?要用梯等式!72×39+72=72x(39+1)=72x40=288072×39+72

72×39+72怎样简便运算?要用梯等式!
72×39+72怎样简便运算?
要用梯等式!

72×39+72怎样简便运算?要用梯等式!
72×39+72
=72x(39+1)
=72x40
=2880

72×39+72
=72*(39+1)
=72*40
=2880

(72*39)+72
=2808+72
=2880

72×(39+1)
=72×40
=2880

72x39+72
=72x(39+1)
=72x40
=2880