965. Обчисліть значення виразу: 1) −1+3; 2) 11+(-3); 3) -20 +/-/; 4) −811+33; 5) 712 +(-824); 6) -611+(-818); 7) -512+10; 35 8) -117+82/; 15 9) -3 1/2+1; 10) 3+(-64); 11) 91+(-5); 12) -38+(-21).​
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