计算:(2x-3y)+(3x+2y) (2a+3b)-(4a-2b) 2(3a的平方+2a+1)-(-2a的平方+3a-5)
问题描述:
计算:(2x-3y)+(3x+2y) (2a+3b)-(4a-2b) 2(3a的平方+2a+1)-(-2a的平方+3a-5)
(5a的平方-3b)-4(a的平方-2b)
答
(2x-3y)+(3x+2y)
=2x-3y+3x+2y
=5x-y;
(2a+3b)-(4a-2b)
=2a+3b-4a+2b
=-2a+5b;
2(3a的平方+2a+1)-(-2a的平方+3a-5)
=6a²+4a+2+2a²-3a+5;
=8a²+a+7;
(5a的平方-3b)-4(a的平方-2b)
=5a²-3b-4a²+8b;
=a²+5b;
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