计算有理数混合运算
2²+(-2)³×5-(-0.28)÷(-2)²
=4+(-8)×5-(-0.28)×1/4
=4+(-40)+0.07
=-37.93
上面那个不对
=4+(-8)×5-(-0.28)×1/4
=4+(-40)-(-0.07)
=4+(-40)+0.07
=-35.93