8a+2b+(5a-b)① (2x-3y)-(5x+4y)② (8a-7b)-2(4a-5b)

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8a+2b+(5a-b)① (2x-3y)-(5x+4y)② (8a-7b)-2(4a-5b)

8a+2b+(5a-b)① (2x-3y)-(5x+4y)② (8a-7b)-2(4a-5b)
8a+2b+(5a-b)
① (2x-3y)-(5x+4y)
② (8a-7b)-2(4a-5b)

8a+2b+(5a-b)① (2x-3y)-(5x+4y)② (8a-7b)-2(4a-5b)
8a+2b+(5a-b)
=8a+2b+5a-b
=13a+b;
① (2x-3y)-(5x+4y)
=2x-3y-5x-4y
=-3x-7y;
② (8a-7b)-2(4a-5b)
=8a-7b-8a+10b
=3b;
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