1楼:醋军强
原式=30/20+3/1
=3/2+3
=1.5+3
=4.5
2楼:
6/5x 5/4+3/1=3/2+3=4又1/2
简算41又1/3x3/4+51又3/4x4/5+61又1/5x5/6
3楼:遇见断桥
应该是51又
1/4吧
41又1/3x3/4+51又1/4x4/5+61又1/5x5/6
=(40+4/3)x3/4+(50+5/4)x4/5+(60+6/5)x5/6
=40x3/4+4/3x3/4+50x4/5+5/4x4/5+60x5/6+6/5x5/6
=30+1+40+1+50+1
=123
如果是51又3/4的话
41又1/3x3/4+51又3/4x4/5+61又1/5x5/6
=(40+4/3)x3/4+(50+7/4)x4/5+(60+6/5)x5/6
=40x3/4+4/3x3/4+50x4/5+7/4x4/5+60x5/6+6/5x5/6
=30+1+40+7/5+50+1
=122+7/5
=123又2/5
4楼:南宫寻情
简化=(40+4/3)x3/4+(50+7/4)x4/5+(60+6/5)x5/6
=(30+1)+(40+1.4)+(50+1)=31+41.4+51
=123.4
完毕 满意的话就采纳吧,有疑问请继续追问
简便计算:4/5-4/5x5/6,3/7x3/21x21x7,4/15x2/19+17/19x4/
5楼:52个星期天
4/5-4/5x5/6
=(1-5/6)x4/5
=1/6x4/5
=2/15
3/7x3/21x21x7
=3/7x7×(3/21×21)
=3×3
=94/15x2/19+17/19x4/15=4/15x(2/19+17/19)
=4/15x1
=4/15
6楼:匿名用户
4/5-4/5x5/6
=4/5×(1-5/6)
=4/5×1/6
=2/15
3/7x3/21x21x7
=(3/7×7)×(3/21×21)
=3×3
=94/15x2/19+17/19x4/19没有简便方法,是不是抄错题了?
7楼:清泉流水时
①=4/5*(1-5/6)=4/5*1/6=2/15
②=3/7*7*(3/21*21)=3*3=9
③=4/19*(2/15+17/19)
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