13dm2=m2 20000cm3=dm=m3
这个鱼缸的底是号玻璃,鱼缸的深是分米,容积是升。
+ = - = 0.6- = 3- - =
- = + = + = 1+ -0.75=
① - +
② -( - )
③ + +
④8.11- +2.89-