(1)2x-10.3x (2)3x-x-5x (3)-b+0.6b-2.6b
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(1)2x-10.3x (2)3x-x-5x (3)-b+0.6b-2.6b
(4)m-n²+m-n² (5)2(4x-0.5) (6)-3(1-1/6x)
(7)-x+(2x-2)-(3x+5) (8)3a²+a²-(2a²-2a)+(3a-a²)
(9)(5a+4a+7b)+(5c-3b-6a) (10)(8xy-x²+y²)-(x²-y²+8xy)
(11)(2x²-1/2+3x)-4(x-x²+1/2) (12)3x²-[7x-(4x-3)-2x²]
(4)m-n²+m-n² (5)2(4x-0.5) (6)-3(1-1/6x)
(7)-x+(2x-2)-(3x+5) (8)3a²+a²-(2a²-2a)+(3a-a²)
(9)(5a+4a+7b)+(5c-3b-6a) (10)(8xy-x²+y²)-(x²-y²+8xy)
(11)(2x²-1/2+3x)-4(x-x²+1/2) (12)3x²-[7x-(4x-3)-2x²]
(1)2x-10.3x=-8.3x; (2)3x-x-5x =-3x; (3)-b+0.6b-2.6b=(-1+0.6-2.6)b=b;
(4)m-n²+m-n² =2m-2n²; (5)2(4x-0.5)=8x-1; (6)-3(1-1/6x)=-3+x/2;
(7)-x+(2x-2)-(3x+5)=-x+2x-2-3x-5=-2x-7;
(8)3a²+a²-(2a²-2a)+(3a-a²)=3a²+a²-2a²+2a+3a-a²=a²+5a.
(9)(5a+4a+7b)+(5c-3b-6a)=(5+4-6)a+(7-3)b+5c=3a+4b+5c;
(10)(8xy-x²+y²)-(x²-y²+8xy)=8xy--x²+y²-x²+y²-8xy=-2x²+2y²;
(11)(2x²-1/2+3x)-4(x-x²+1/2)=2x²-1/2+3x-4x+4x²-2=6x²-x-5/2;
(12)3x²-[7x-(4x-3)-2x²]=3x²-[7x-4x+3-2x²]=3x²-7x+4x-3+2x²=5x²-3x-3.
(4)m-n²+m-n² =2m-2n²; (5)2(4x-0.5)=8x-1; (6)-3(1-1/6x)=-3+x/2;
(7)-x+(2x-2)-(3x+5)=-x+2x-2-3x-5=-2x-7;
(8)3a²+a²-(2a²-2a)+(3a-a²)=3a²+a²-2a²+2a+3a-a²=a²+5a.
(9)(5a+4a+7b)+(5c-3b-6a)=(5+4-6)a+(7-3)b+5c=3a+4b+5c;
(10)(8xy-x²+y²)-(x²-y²+8xy)=8xy--x²+y²-x²+y²-8xy=-2x²+2y²;
(11)(2x²-1/2+3x)-4(x-x²+1/2)=2x²-1/2+3x-4x+4x²-2=6x²-x-5/2;
(12)3x²-[7x-(4x-3)-2x²]=3x²-[7x-4x+3-2x²]=3x²-7x+4x-3+2x²=5x²-3x-3.
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