简算:32.4-12.4*1.8
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/08 21:50:50
![简算:32.4-12.4*1.8](/uploads/image/z/201046-22-6.jpg?t=%E7%AE%80%E7%AE%97%EF%BC%9A32.4-12.4%2A1.8)
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简算:32.4-12.4*1.8
简算:32.4-12.4*1.8
简算:32.4-12.4*1.8
既然是简便方法,楼上两位从32.4看出是18*1.8,有点难了点
32.4-12.4*1.8=32.4-12.4*(2-0.2)=32.4-12.4*2+12.4*0.2
=32.4-24.8+2.48
=(32.4+2.48)-24.8
=34.88-24.8=10.08
=18*1.8 - 12.4*1.8
=1.8*(18-12.4)
=1.8*(5.6)
=(2-0.2)*(5.6)
=11.2-1.12
=10.08
32.4-12.4*1.8=1.8*18-12.4*1.8=1.8*(18-12.4)
1.8*(18-12.4)=1.8*5.6=10.08