1-(1-0.5)²×1/5×[2+(-3)³]
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1-(1-0.5)²×1/5×[2+(-3)³]
1-(1-0.5)²×1/5×[2+(-3)³]
1-(1-0.5)²×1/5×[2+(-3)³]
1-(1-0.5)²×1/5×[2+(-3)³]
=1-1/4x1/5x(2-27)
=1-1/20*(-25)
=1+5/4
=2又4分之1