求解几道计算题 -4.2+5.7-8.4+10 6.1-3.7-4.9+1.8 1/3-2/3+1 (-1/4)+5/6+2/3-2/1

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求解几道计算题 -4.2+5.7-8.4+10 6.1-3.7-4.9+1.8 1/3-2/3+1 (-1/4)+5/6+2/3-2/1

求解几道计算题 -4.2+5.7-8.4+10 6.1-3.7-4.9+1.8 1/3-2/3+1 (-1/4)+5/6+2/3-2/1
求解几道计算题 -4.2+5.7-8.4+10 6.1-3.7-4.9+1.8 1/3-2/3+1 (-1/4)+5/6+2/3-2/1

求解几道计算题 -4.2+5.7-8.4+10 6.1-3.7-4.9+1.8 1/3-2/3+1 (-1/4)+5/6+2/3-2/1
-4.2+5.7-8.4+10
=-12.6+15.7
=3.1
6.1-3.7-4.9+1.8
=7.9-8.6
=-0.7
1/3-2/3+1
=2/3
(-1/4)+5/6+2/3-1/2
=5/6+2/3-1/4-1/2
=3/2-1/4-1/2
=3/4