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2×一(4x+5xy1一3y?)+2(34X-52Xy-23y),1其中x=2,y=2·
2个回答
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先将给定表达式简化,然后再代入数值计算,:
原表达式:
2×一(4x+5xy-3y)+2(34x-52xy-23y)
先进行简化:
2×(4x+5xy-3y)+2(34x-52xy-23y)
= 8x+10xy-6y+68x-104xy-46y
= 76x-94xy-52y
将x=2,y=2代入简化后的表达式:
76×2-94×2×2-52×2
= 152-376-104
= -328
原表达式:
2×一(4x+5xy-3y)+2(34x-52xy-23y)
先进行简化:
2×(4x+5xy-3y)+2(34x-52xy-23y)
= 8x+10xy-6y+68x-104xy-46y
= 76x-94xy-52y
将x=2,y=2代入简化后的表达式:
76×2-94×2×2-52×2
= 152-376-104
= -328
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