Explicación paso a paso:
1) 25-2x(12)+9
25-24+9
1+9
8
2) 22-10+3x9
22-10+27
12+27
39
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Explicación paso a paso:
1) 25-2x(12)+9
25-24+9
1+9
8
2) 22-10+3x9
22-10+27
12+27
39