Explicație pas cu pas:
x=numarul necunoscut
a) 25,34+x=84,175
x=84,175-25,340 (se considera o infinitate de 0 dupa ultima cifra)
x=58,835
b) 181,08+x=199,99
x=199,99-181,08
x=18,91
c)x-18,34=54,01
x=54,01+18,34
x=72,35
d)x-101,7=98,16
X=98,16+101,70
x=99,86
e) 1254,16+35,008=1289,168
f) 7028,08+152,12=7180,2