解方程.(1)1.69/(X-2)=1.3 (2).X:9/7=14:3.6 (3).1/(X+2/3)=4/5答对有分!

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解方程.(1)1.69/(X-2)=1.3 (2).X:9/7=14:3.6 (3).1/(X+2/3)=4/5答对有分!
解方程.(1)1.69/(X-2)=1.3 (2).X:9/7=14:3.6 (3).1/(X+2/3)=4/5
答对有分!

解方程.(1)1.69/(X-2)=1.3 (2).X:9/7=14:3.6 (3).1/(X+2/3)=4/5答对有分!
(1)1.69/(X-2)=1.3
1.3/(x-2)=1
1.3=x-2
x=3.3
(2).X:9/7=14:3.6
x*3.6=14*9/7
x*3.6=18
x=5
(3).1/(X+2/3)=4/5
4*(x+2/3)=5
4x+8/3=5
4x=7/3
x=7/12

。(1)1.69/(X-2)=1.3
x-2=1.69/1.3=1.3
x=3.3


(2).X:9/7=14:3.6
x=9/7*14÷3.6
=18/3.6
=5
(3).1/(X+2/3)=4/5
x+2/3=5/4
x=5/4-2/3
=7/12

(1)1.3(x-2)=1.69 1.3x-2.6=1.69 1.3x=4.29 x=3.3 (2)x*7/9=14*10/36 x=14*10/36*9/7 x=5 (3)4x+8/3=5 4x=7/3 x=7/12

(1)1.69/(X-2)=1.3
X-2=1.63/1.3
x-2=1.25
x=1.25+2=3.25
(2)x:9/7=14:3.6
14x=3.6*(9/7) (9/7=1.3)
...

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(1)1.69/(X-2)=1.3
X-2=1.63/1.3
x-2=1.25
x=1.25+2=3.25
(2)x:9/7=14:3.6
14x=3.6*(9/7) (9/7=1.3)
14x=4.68
x=0.33
(3)1/(x+2/3)=4/5
x+2/3=1/(4/5)
x+2/3=5/4
x=5/4-2/3=7/12

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