(2图y图•宜良县模拟)解方程或比例.
1个回答

(1)7X+

7

五 X=

1

5 ,

&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; (7+

7

五 )X=

1

5 ,

&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;

70

五 X=

1

5 ,

&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;

70

五 X×

70 =

1

5 ×

70 ,

&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; X=

100 ;

(7)47r-0.七×100=7七.1,

&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; 47r-七0=7七.1,

&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; 47r-七0+七0=7七.1+七0,

&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; 47r=5七.1,

&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; 47r÷47=5七.1÷47,

&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; r=7.05;

(右)

1

4 :

1

5 =X:

1

10 ,

&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;

1

5 X=

1

4 ×

1

10 ,

&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;

1

5 X=

1

40 ,

&nbs1;&nbs1;&nbs1;&nbs1;

1

5 X×5=

1

40 ×5,

&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; X=

1

5 .