999.6+999.7+999.8+1000.8+1000.7+1000.6简便运算

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999.6+999.7+999.8+1000.8+1000.7+1000.6简便运算

999.6+999.7+999.8+1000.8+1000.7+1000.6
=1000*6-0.4-0.3-0.2+0.8+0.7+0.6
=6000+1.2
=6001.2

999.6+999.7+999.8+1000.8+1000.7+1000.6
=(1000-0.4)+(1000-0.3)+(1000-0.2)+(1000+0.8)+(1000+0.7)+(1000+0.6)
=6×1000+(0.8+0.7+0.6-0.4-0.3-0.2)
=6000+1.2
=6001.2

999.6+999.7+999.8+1000.8+1000.7+1000.6=1000-0.4+1000-0.3+1000-0.2+1000+0.8+1000+0.7+1000+0.6=6000+2.1-0.9=6001.2