
计算:(1)(+3)-(-2);(2)(-1)-(+2);(3)0-(-3);(4)1-5;(5)(-23)-(-12);(6)
计算:(1)(+3)-(-2);(2)(-1)-(+2);(3)0-(-3);(4)1-5;(5)(-23)-(-12);(6)(-1.3)-2.6;(7)23-(-12...
计算:(1)(+3)-(-2);(2)(-1)-(+2);(3)0-(-3);(4)1-5;(5)(-23)-(-12);(6)(-1.3)-2.6;(7) 2 3 -(- 1 2 );(8)(- 1 6 )-(- 1 2 ).
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(1)(+3)-(-2), =3+2, =5; (2)(-1)-(+2), =-1-2, =-3; (3)0-(-3), =0+3, =3; (4)1-5=-4; (5)(-23)-(-12), =-23+12, =-11; (6)(-1.3)-2.6, =-1.3-2.6, =-3.9; (7)
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