Question

（2图y图•宜良县模拟）解方程或比例．

Answer 1

（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×

五

70 =

1

5 ×

五

70 ，

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

五

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 ．