45÷12+12÷55用简便方法怎么计算
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45÷12+12÷55
=15÷4+11/55+1/55
=3.95+1/55
=79/20+1/55
=(79*55+20)/1100
=(80*55-55+20)/1100
=(4400-35)/1100
=4365/1100
=873/220
*********************************
45÷12+12÷55
=15/4+12/55
=(15*55)/220+48/220
=(550+275+48)/220
=873/220
=15÷4+11/55+1/55
=3.95+1/55
=79/20+1/55
=(79*55+20)/1100
=(80*55-55+20)/1100
=(4400-35)/1100
=4365/1100
=873/220
*********************************
45÷12+12÷55
=15/4+12/55
=(15*55)/220+48/220
=(550+275+48)/220
=873/220
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