a)2,5m²=250dm²
1,2dam²=12000dm²
250dm²+12000dm²=12250dm²
b)15km²=1500ha
17200ari=172ha
1500ha+172ha=1672ha
c)6000cm²=0,0000006m²
12dm²=0,12m²
0,0000006m²+xm²=0,12m²
0,12m²-0,0000006m²=0,1199994m²
d)5ha=5hm²
0,3km=30hm²
4300m²=0,43hm²
5hm²+30hm²-xhm²=0,43hm²
35hm²-xhm²=0,43hm²
-xhm²=0,43hm²-35hm²
-xhm²=-34,57hm²
x=34,57hm²
e)0,0002hm²=2m²
48dam²=4800m²
2300dm²=23m²
2m²-xm²+4800m²=23m²
-xm²+4802m²=23m²
-xm²=23m²-4802m²
-xm²=-4779m²
x=4779m²
f)583dm²=5,83m²
1300cm²=0,13m²
5,83m²+xm²+0,13m²=7m²
xm²=7m²-5,83m²-0,13m²
xm²=1,04m²
x=1,04m²
