计算:(1)-16+23+(-17)-(-7);(2)(- 1 8 )+(- 1 4 )-(- 3 8
计算:(1)-16+23+(-17)-(-7);(2)(-18)+(-14)-(-38)-(+12)-(-34)(3)(-12+34-58)×(-16)(4)-14+(1...
计算:(1)-16+23+(-17)-(-7);(2)(- 1 8 )+(- 1 4 )-(- 3 8 )-(+ 1 2 )-(- 3 4 )(3)(- 1 2 + 3 4 - 5 8 )×(-16)(4)-1 4 +(1-0.5)× 1 3 ×〔2-(-3) 2 〕
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(1)-16+23+(-17)-(-7) =-16+23-17+7 =-33+30 =-3; (2)(- )+(- )-(- )-(+ )-(- ) =- + - + - =(- + )- + - = - = ; (3)(- + - )×(-16) =(- )×(-16)+ ×(-16)- ×(-16) =8-12+10 =18-12 =6; (4)-1 4 +(1-0.5)× ×〔2-(-3) 2 〕 =-1+ × ×(2-9) =-1+ = . |
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