a=4,b=3,代数式a-[b+2a-(a-b)]的值为?
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![a=4,b=3,代数式a-[b+2a-(a-b)]的值为?](/uploads/image/z/14906120-32-0.jpg?t=a%3D4%2Cb%3D3%2C%E4%BB%A3%E6%95%B0%E5%BC%8Fa-%5Bb%2B2a-%EF%BC%88a-b%EF%BC%89%5D%E7%9A%84%E5%80%BC%E4%B8%BA%3F)
a=4,b=3,代数式a-[b+2a-(a-b)]的值为?
a=4,b=3,代数式a-[b+2a-(a-b)]的值为?
a=4,b=3,代数式a-[b+2a-(a-b)]的值为?
a-[b+2a-(a-b)]
=a-(b+2a-a+b)
=a-(2b+a)
=a-2b-a
=-2b
=-2×3
=-6
原式=a-[b+2a-a+b]=a-(2b+a)=-2b=-6
原式=a-(b+2a-a+b)=a-(2b+a)=a-2b-a=-2b.将b值带入,则原式=-2×3=-6