5+ 2= - 7, 14+ 3= - 17, 18+1= - 19, 21+ 5= - 26, 17+3= - 20, 20+10= - 30, 9+9= - 18, 12+12= - 24, 12-12= - 0, 21-7= - 14, 18-8= - 10, 21-10= - 11, 13+14= - 27, 11+11= - 22, 20+20= - 40,

Matematica- Suma y Resta

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