(-19.5+2.76)-(2.76+3.5)等于多少;-【+(-2)】-【+(-4)】等于多少.

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(-19.5+2.76)-(2.76+3.5)等于多少;-【+(-2)】-【+(-4)】等于多少.
(-19.5+2.76)-(2.76+3.5)等于多少;-【+(-2)】-【+(-4)】等于多少.

(-19.5+2.76)-(2.76+3.5)等于多少;-【+(-2)】-【+(-4)】等于多少.
(-19.5+2.76)-(2.76+3.5)=-19.5+2.76-2.76-3.5=-19.5-3.5=-23 -【+(-2)】-【+(-4)】=2+4=6
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(-19.5+2.76)-(2.76+3.5) =(-19.5-3.5)+(2.76-2.76) =-23 -【+(-2)】-【+(-4)】 =2+4=6