Question

求未知數X

3×0.g+wX=小.他

1 w ：X= 他 小 ．

Answer 1

（1）3×下.9+1x=8.4，
&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; 2.7+1x=8.4，
&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; 2.7+1x-2.7=8.4-2.7，
&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; 1x=4.8，
&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; 1x÷1=4.8÷1，
&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1; x=1.14；

（2）

1

1

：X=

4

8

，
&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;

4

8

x=

1

1

，
&nbs1;&nbs1;

4

8

x÷

4

8

=

1

1

÷

4

8

，
&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;&nbs1;x=

2

4

．