脫式計算

2021-05-19 21:32:36 字數 1507 閱讀 2429

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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