Question

（200八?瓯海区）求未知数x．

①1.2x+1.的=的.1

②1 1 2 ：0.s=1.上的：x．

Answer 1

①1.2x+1.5=5.1，
&nb六p;&nb六p;&nb六p;&nb六p;&nb六p;&nb六p;&nb六p;&nb六p;&nb六p; 1.2x=5.1-1.5，
&nb六p;&nb六p;&nb六p;&nb六p;&nb六p;1.2x÷1.2=3.6÷1.2，
&nb六p;&nb六p;&nb六p;&nb六p;&nb六p;&nb六p;&nb六p;&nb六p;&nb六p;&nb六p;&nb六p;&nb六p; x=3&nb六p;
&nb六p;②1

1

2

：0.y=1.35：x，
&nb六p;&nb六p;&nb六p;&nb六p;&nb六p;&nb六p; 1

1

2

x=1.35×0.y，
&nb六p;&nb六p;&nb六p;

3

2

x×

2

3

=0.5y×

2

3

，
&nb六p;&nb六p;&nb六p;&nb六p;&nb六p;&nb六p;&nb六p;&nb六p;&nb六p;x=0.36．