(2+27×9分之8)÷5分之2 3分之1÷+3分之2×5分之1 1-2分之1÷14分之9×7分之4 几道数学题帮个忙啊~

(2+27×9分之8)÷5分之2 3分之1÷+3分之2×5分之1 1-2分之1÷14分之9×7分之4 几道数学题帮个忙啊~

( 2 + 27 X 8/9 ) / (2/5)
= ( 2 + 3 X 8 ) X 5/2
= ( 1 + 12 ) X 5
= 65

(1/3) / (2/3) X (1/5)
= 1/2 X 1/5
= 1/10

1 - (1/2) / (9/14) X (4/7)
= 1 - (1/2) X (14/9) X (4/7)
= 1 - (1 X 14 X 4) / (2 X 9 X 7)
= 1 - 4/9
= 5/9

( 1/2 + 1/3 - 1/5 ) X 60
= 60/2 + 60/3 - 60/5
= 30 + 20 - 12
= 30 + 8
= 38

(4/21) X 19 + 23 / (1/42)

(11/13) X ( 1/8 + 3/4 ) / (77/26)
= (11/13) X ( 1/8 + 6/8 ) X (26/77)
= (11/13) X (7/8) X (26/77)
= (11 X 7 X 26) / (13 X 8 X 77)
= 1/4

(11/30) / [ (2/3) / (1/5) X 1/13 ]
= (11/30) / [ (2/3) X 5 X 1/13 ]
= (11/30) / [ (2 X 5 X 1) / (3 X 13) ]
= (11/30) X (39/10)
= (11 X 39) / (30 X 10)
= 1.43

x / (2/3) = 5/8
x = 5/8 X 2/3 = 10/24
x = 5/12

5x - 5/6 = 5/12
x - 1/6 = 1/12
x = 1/12 + 1/6 = 1/12 + 2/12 = 3/12
x = 1/4

给分不？给的解答哦！追问分不多啊！！希望给答案要过程的追答先给方程哦！追问嗯，快点追答x÷2/3=5/8 5x-5/6=5/12
x=5/8*2/3 5x=5/12+5/6
x=5/12 x=4/5÷5
x=1/4追问继续啊追答不飞待简便算法吧追问嗯追答



 
本人书写较差，请谅解啊，我发图片

2 + 27 X 8/9 ) / (2/5)
= ( 2 + 3 X 8 ) X 5/2
= ( 1 + 12 ) X 5
= 65

(1/3) / (2/3) X (1/5)
= 1/2 X 1/5
= 1/10

1 - (1/2) / (9/14) X (4/7)
= 1 - (1/2) X (14/9) X (4/7)
= 1 - (1 X 14 X 4) / (2 X 9 X 7)
= 1 - 4/9
= 5/9

( 1/2 + 1/3 - 1/5 ) X 60
= 60/2 + 60/3 - 60/5
= 30 + 20 - 12
= 30 + 8
= 38

(4/21) X 19 + 23 / (1/42)

(11/13) X ( 1/8 + 3/4 ) / (77/26)
= (11/13) X ( 1/8 + 6/8 ) X (26/77)
= (11/13) X (7/8) X (26/77)
= (11 X 7 X 26) / (13 X 8 X 77)
= 1/4

(11/30) / [ (2/3) / (1/5) X 1/13 ]
= (11/30) / [ (2/3) X 5 X 1/13 ]
= (11/30) / [ (2 X 5 X 1) / (3 X 13) ]
= (11/30) X (39/10)
= (11 X 39) / (30 X 10)
= 1.43

x / (2/3) = 5/8
x = 5/8 X 2/3 = 10/24
x = 5/12

5x - 5/6 = 5/12
x - 1/6 = 1/12
x = 1/12 + 1/6 = 1/12 + 2/12 = 3/12
x = 1/4

解：(2+27×9分之8)÷5分之2
=(2+24)*5/2
=5+60
=65
解：3分之1÷3分之2×5分之1
=1/3*3/2*1/5
=0.1
解：1-2分之1÷14分之9×7分之4
=1-1/2*14/9*4/7
=1-4/9
=5/9
解：(2分之1+3分之1-5分之1)×60
=1/2*60+1/3*60-1/5*60
=30+20-12
=38
解：21分之4×19+23÷42分之1
=4/19+23*42
=76/21+966
=3又21分之13+966
=969又21分之13
解：13分之11×(8分之1+4分之3)÷26分之77
=11/13*7/8*26/77
=1/4
解：30分之11÷{(3分之2÷5分之1)×13分之1}
=11/30÷{(2/3*5*1/13}
=11/30*39/10
=143/100
=1.43
解：x÷3分之2=8分之5
X=5/8*2/3
X=5/12
解：5x-6分之5=12分之5
5X=5/12+10/12
5X=5/4
X=1/4
望采纳！祝你学习进步！