Вычислите,используя свойства сложения 1) (17+5)-12;-24+(13)+(-6);-1,5+4,7+(-2,5);2) 19+(-6)+21; -11+(-9)+14; -8+16+(-2);3) 8,2+(-3)+1,8; -4,3+9+(-1,7); 6+(-0,7)+4.
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