0.65×0.99 简便计算顺便9.38×13-9.38×4+9.38
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![0.65×0.99 简便计算顺便9.38×13-9.38×4+9.38](/uploads/image/z/66453-69-3.jpg?t=0.65%C3%970.99+%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%E9%A1%BA%E4%BE%BF9.38%C3%9713-9.38%C3%974%2B9.38)
0.65×0.99 简便计算顺便9.38×13-9.38×4+9.38
0.65×0.99 简便计算
顺便
9.38×13-9.38×4+9.38
0.65×0.99 简便计算顺便9.38×13-9.38×4+9.38
0.65×0.99
=0.65×(1-0.01)
=0.65×1-0.65×0.01
=0.65-0.0065
=0.6435
0.65×0.99
=0.65×(1-0.01)
=0.65-0.0065
=0.6435
9.38×13-9.38×4+9.38
=9.38×(13-4+1)
=9.38×10
=93.8
0.65(1-0.01)=0.65-0.0065=0.6435
思路:0.99接近1,0.65X1便于计算,将0.99补成1,再减去0.01
0.65×0.99
=0.65×(1-0.01)
=0.6435
9.38(13-4+1)=9.38*10=93.8 提取公因式
0.65×0.99
=0.65×(1-0.01)
=0.65×1-0.65×0.01
=0.65-0.0065
=0.6435
遇到问题仔细思考,脑子会越用越灵活
0.65×(1-0.01)
=0.65×1-0.65×0.01
=6.5-0.0065
=6.4935