计算:(1)(-2.8)-(+1.2);(2)(-6)+(+5);(3)-(-2)-|-3|;(4)(- 1 4 )-(
计算:(1)(-2.8)-(+1.2);(2)(-6)+(+5);(3)-(-2)-|-3|;(4)(-14)-(-0.25);(5)(-0.6)+1.7+(+0.6)+...
计算:(1)(-2.8)-(+1.2);(2)(-6)+(+5);(3)-(-2)-|-3|;(4)(- 1 4 )-(-0.25);(5)(-0.6)+1.7+(+0.6 )+(-1.7 )+(-9 );(6) |-2 1 2 |-(-2.5)+1-|1-2 1 2 | ;(7) 3 1 2 -(-2 1 4 )+(- 1 3 )- 1 4 -(+ 1 6 ) .
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(1)(-2.8)-(+1.2), =-2.8-1.2, =-4; (2)(-6)+(+5), =-6+5, =-1; (3)-(-2)-|-3|, =2-3, =-1; (4)(-
=-
=0; (5)(-0.6)+1.7+(+0.6 )+(-1.7 )+(-9 ); =(-0.6)+(+0.6)+1.7+(-1.7)+(-9), =-9; (6)|-2
=2
=6-1
=4
(7)3
=3
=3
=1. |
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