作业帮丨2a-4丨+（2a+3b-13）²=0
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丨2a-4丨+（2a+3b-13）²=0
丨2a-4丨+（2a+3b-13）²=0
丨2a-4丨+（2a+3b-13）²=0
丨2a-4丨+（2a+3b-13）²=0 怎么解?
2a =4
2a+3b-13 =0
3b = 13-4 = 9
b=3
a=2