计算:2(2x-3y)-3(4x-5y)
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计算:2(2x-3y)-3(4x-5y)
计算:2(2x-3y)-3(4x-5y)
计算:2(2x-3y)-3(4x-5y)
2(2x-3y)-3(4x-5y)
=4x-6y-12x+15y
=(4x-12x)+(15y-6y)
=-8x+9y
2(2x-3y)-3(4x-5y)
=4x-6y-12x+15y
=-8x+9y
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