+ = 2- = - = + + =
+ = + = + = - - =
15.5× = 1÷ ×7= 2.1÷ =
0.75+ = - ×0= 12.6-1.7=
×5÷ ×5=
1- - =1-( ) +( - )= +
+ = +0.625= - = - = 112=
1- = 2.5- = 1- - = -( - )=
乔木林占公园面积的 ,灌木林占公园面积的 ,草地占公园面积的 。森林部分(包括乔木林和灌木林)比草地部分多占公园面积的几分之几?
+ = - = 0.6- = 3- - =
- = + = + = 1+ -0.75=