(+4)-(-7)
=4+7
=11
0-(-5)
=0+5
=5
1.9-(0.6)
=1.9+0.6
=2.5
(-2.5)-5.9
=-(2.5+5.9)
=-8.4
1-4+3-0.5
=-3+3-0.5
=-0.5
-2.4+3.5-4.6+3.5
=-(2.4+4.6)+(3.5+3.5)
=-7+7
=0
(-7)-(+5)+(-4)-(-10)
=-7-5-4+10
=-6
四分之三减二分之七加(负六分之一)减(负三分之二)减1
=3/4-7/2-1/6+2/3-1
=9/12-42/12-2/12+8/12-1
=(9-42-2+8)/12-1
=-27/12-1
=-(9/4+4/4)
=-13/4 (-4分之13)