
(-2.4)+(-3.7)+(+4.2)+0.7+(-4.2)
1个回答
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(-2.4)+(-3.7)+(+4.2)+0.7+(-4.2)
=-2.4-3.7+4.2+0.7-4.2
=-2.4-3.7-4.2+4.2+0.7
=-2.4-3.7+0.7
=-2.4-3
=-5.4
=-2.4-3.7+4.2+0.7-4.2
=-2.4-3.7-4.2+4.2+0.7
=-2.4-3.7+0.7
=-2.4-3
=-5.4
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