用简便计算,78×99 720×37÷36

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用简便计算,78×99 720×37÷36

用简便计算,78×99 720×37÷36
用简便计算,78×99 720×37÷36
 

用简便计算,78×99 720×37÷36
=78×(100-1)
=7800-78
=7722
=720÷(4×9)×37
=720÷9÷4×37
=740

78✘(100-1)

78×99
=78×(100-1)
=7800-78
=7722

78X99
=78X(90+9)
=78X90+78X9
=7020+702
=7722

78X(100一1)=78X100一78x1=7800一78=7722

700*37-700*36+40

(720×36+720)÷36=720+20=740