102*76-58*98的简便运算?

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102*76-58*98的简便运算?

102*76-58*98的简便运算?
102*76-58*98的简便运算?

102*76-58*98的简便运算?
102*76-58*98
=(100+2)x76-58x(100-2)
=7600+152-5800+116
=1800+268
=2068

=(100+2)*76-58*(100-2)
=100*76+2*76-58*100+58*2
=7600+152-5800+116
=1800+268
=2068

(100+2)*76-(100-2)*(60-2)
=7600+152-(4-320+6000)
=1600+468
=2068

102×76-58×98=(100+2)×76-58×(100-2)
=76×100+2×76-58×100+58×2=100×(76-58)+2×(76+58)
=1800+268=2068