-8.4+1又二分之一加负五分之二加-0.3+2又五分之三?
3个回答
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-8.4+1又1/2+(-2/5)+(-0.3)+2又3/5
=-(8+0.4)+(1+1/2)+(-2/5)-0.3+(2+3/5)
=-8-0.4+1+0.5-2/5-0.3+2+3/5
=(-8+1+2)+(-0.4+0.5-0.3)-(2/5-3/5)
=-5-0.2-(-1/5)
=-5-0.2+0.2
=-5
=-(8+0.4)+(1+1/2)+(-2/5)-0.3+(2+3/5)
=-8-0.4+1+0.5-2/5-0.3+2+3/5
=(-8+1+2)+(-0.4+0.5-0.3)-(2/5-3/5)
=-5-0.2-(-1/5)
=-5-0.2+0.2
=-5
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-8.4+l又1/2+(一2/5)十(一0.3)+2又3/5
=一0.8+1.5一0.4一0.3+2.6
=0.7一(0.4+0.3)+2.6
=0.7一0.7+2.6
=2.6
=一0.8+1.5一0.4一0.3+2.6
=0.7一(0.4+0.3)+2.6
=0.7一0.7+2.6
=2.6
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