1樓:小辣
(2/7+1/5)*7*5
=2/7*7*5+1/5*7*5
=10+7
=173/13*4/5+10/13*4/5-4/5=4/5*(3/13+10/13-1)
=4/5*0=0
2樓:妙酒
(2/7+1/5)*7*5
=2/7x35+1/5x35
=10+7
=173/13*4/5+10/13*4/5-4/5=4/5x(3/13+10/13-1)
=4/5x0=0
2/7+5/14+1/2,用脫式計算。
3樓:瀛洲煙雨
2/7+5/14+1/2,用脫式計算。
=4/14+5/14+7/14
=9/14+7/14
=16/14
=8/7
4樓:小樂笑了
=4/14+5/14+7/14
=(4+5+7)/14
=16/14
=8/7
脫式計算(3/4+1/6)*2/3 25*1/5-5*1/5 6/11*7/15*10 (1/7+1/4)*28 (21+2/5)*5/7 39*7/13*2/3
5樓:匿名使用者
脫式計算
(3/4+1/6)
*2/3
=3/4*2/3+1/6*2/3
=1/2+1/9
=11/18
25*1/5-5*1/5
=5-1
=46/11*7/15*10
=84/33
=28/11
(1/7+1/4)*28
=1/7*28+1/4*28
=4+7
=11(21+2/5)*5/7
=21*5/7+2/5*5/7
=15+2/7
=15又2/7
39*7/13*2/3=14
脫式計算(3/4+1/6)*2/3 25*1/5-5*1/5 6/11*7/15*10 (1/7+1/4)*28 (21+2/5)*5/7 39*7/13*2/3
6樓:匿名使用者
(3/4+1/6)*2/3 =(9/12+2/12)x2/3=11/18
25*1/5-5*1/5 =5-1=4
6/11*7/15*10 =60/15x7/11=28/11(1/7+1/4)*28 =4+7=11
(21+2/5)*5/7 =15+2/7
39*7/13*2/3=14
60*2/5=12x2=24
4*2/9=8/9
3/10*2/3+1/4=1/5+1/4=9/2020*2/5-5/8 =8-5/8=6+3/82/9*8+2/9=2 /9x(8+1)=25/7*1/5*49 =1/7
48*1/12*5/6 =20/6=10/3
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