-2³÷4/9×(-2/3)²+(-0.8)-5×(-1/4)
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-2³÷4/9×(-2/3)²+(-0.8)-5×(-1/4)
-2³÷4/9×(-2/3)²+(-0.8)-5×(-1/4)
-2³÷4/9×(-2/3)²+(-0.8)-5×(-1/4)
原式=-8*9/4*4/9+(-0.8)-(-1.25)
=-8+1.25-0.8
=-8+0.45
=-7.55
原式=-8-0.8+1.25=-7.55