Răspuns:
Explicație pas cu pas:
ex :15
(540:4x9-1199)x(a-25:5-39)-37=59
(135x9-1199)x(a-5-39)-37=59
(1215-1199)x (a-5-39)-37=59
16x(a-5-39)=59+37=96
a-5-39=96:16=6
a-5=6+39=45
a=45+5=50
a=50
Compara
(252:3+96:3) +298 ___98x5-76
(84+32)+298___490-76
116+298___414
414=414
186x7+210:7-41___10000-960:4-5941
1302+30-41___10000-240-5941
1291___9760-5941
1291 <3819
450:5+17x7+100___200:4x6-139+79
90+119+100___50x6-139+79
309___300-139+79
309>240
