
-31-(+27)怎么计算?
3个回答
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解:-31-(27)等于( -58 )
∵已知需求出-31-(27)等于多少
-A - (B) = -A - B
∴-31-(27)
= -31 - 27
= -(31 + 27)
= -[(30 + 1)+(30 - 3)]
= -(30 + 1 + 30 - 3)
= -[(30 + 30)+(1 - 3)]
= -(60 - 2)
= -58
答:-31-(27)等于-58
∵已知需求出-31-(27)等于多少
-A - (B) = -A - B
∴-31-(27)
= -31 - 27
= -(31 + 27)
= -[(30 + 1)+(30 - 3)]
= -(30 + 1 + 30 - 3)
= -[(30 + 30)+(1 - 3)]
= -(60 - 2)
= -58
答:-31-(27)等于-58
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