计算5分之8-|-1又2分之1|-(+2又4分之1)-(-2.75)\\
=8/5-3/2-9/4+2.75
=1.6+2.75-1.5-2.25
=4.35-3.75
=0.6;
3(3a²-2ab)-2(4a²-ab),
=9a²-6ab-8a²+2ab
=a²-4ab
=a(a-4b);
2x-2[2(x+3y)-3(x-2y)]
=2x-2[2x+6y-3x+6y]
=2x-2[12y-x]
=2x-24y+2x
=4x-24y;
=4(x-6y);
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1.6-1.5-2.25+2.75
=0.1+0.5=0.6
9a²-6ab-8a²+4ab
=a²-2ab
2x-2(2x+6y-3x+6y)
=2x-2(12y-x)
=4x-24y