(985-234)+(985-166)简便计算怎样简便?

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(985-234)+(985-166)简便计算怎样简便?(985-234)+(985-166)简便计算怎样简便?(985-234)+(985-166)简便计算怎样简便?(985-234)+(985-1

(985-234)+(985-166)简便计算怎样简便?
(985-234)+(985-166)简便计算
怎样简便?

(985-234)+(985-166)简便计算怎样简便?
(985-234)+(985-166)
=985*2-(234+166)
=(1000-15)*2-400
=2000-30-400
=1570

(985-234)+(985-166)
=985-234+985-166
=985+985-(234+166)=1970-400=1570

(985-234)+(985-166)=(985+985)-(234+166)=1970-400=1570

提公因式
985(-234-166)
=985*(-400)
=-394000