0.01+0.02+0.03+0.04……+0.97+0.98+0.99用简便方法

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0.01+0.02+0.03+0.04……侍帆宴+0.97+0.98+0.99
=1/100(1+2+3+.......97+98+99)
1+2+3+.......97+98+99=（1+100）+（2+99）+......(50+51)=
101×50=5050 -99=4951
0.01+0.02+0.03+0.04……老银+0.97+0.98+0.99=1/100*4951=49.51
俊狼轿灶精英为您解答

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=(0.01+0.99)+(0.02+0.98)+……+(0.49+0.51)+0.50
=1+1+…橡搏高培…梁念祥+1+0.50
=1×49+0.50
=49.50

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=[(0.01+0.99)+(0.02+0.98)+…饥友戚烂陵告盯+(0.49+0.51)]+0.5
=(1+1+…+1)+0.5
=49+0.5
=49.5

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