计算。(1)5+(-7)-(-2) (2)(-4 )-(-5 )+(+4 )-(+5 )(3)(- )×1.25
计算。(1)5+(-7)-(-2)(2)(-4)-(-5)+(+4)-(+5)(3)(-)×1.25÷(-)(4)(-)÷(-)(5)(-7)×(-3)×(-0.5)+(...
计算。(1)5+(-7)-(-2) (2)(-4 )-(-5 )+(+4 )-(+5 )(3)(- )×1.25÷(- ) (4)( - )÷(- )(5)(-7)×(-3)×(-0.5)+(-12)×(-2.6)(6)( + - )÷
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