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78乘99加78的简便运算

78*99+78 =(99+1)*78 =100*78 =7800

78*99+78 =78*99+1 =7800

78*99-78=78*(100-1)-78=7800-78-78=7800-80*2-2*2=7800-160-4=7640-4=7636

78*99+78=78x99+78x1=78x(99+1)=78x100=7800

1、所加的那个78可以看作1*782、原式=99*78+1*78 =(99+1)*78 =100*78 =78003、作用加法的结合律.

99*78+78=(99+1)*78=7800

99*78+78=(99+1)*78=100*78=7800

78*99+78 =78*99+78 =78*99+79*1 =78*(99+1) =78*100 =7800

78*99+78 =78(100-1)+78 =7800-78+78 =7800 谢谢,望采纳

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