计算:-4x²+25(x+3y)(2x-y)2(x+5)(x-4)-3(x-6)(x+1)13.25²
来源:学生作业帮 编辑:搜搜考试网作业帮 分类:数学作业 时间:2024/07/30 18:55:59
计算:
-4x²+25
(x+3y)(2x-y)
2(x+5)(x-4)-3(x-6)(x+1)
13.25²-6.25²(简算)
分解因式:
4x(a-b)-8y(b-a)
-4x²+25
(x+3y)(2x-y)
2(x+5)(x-4)-3(x-6)(x+1)
13.25²-6.25²(简算)
分解因式:
4x(a-b)-8y(b-a)
![计算:-4x²+25(x+3y)(2x-y)2(x+5)(x-4)-3(x-6)(x+1)13.25²](/uploads/image/z/16544775-39-5.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A-4x%26sup2%3B%2B25%EF%BC%88x%2B3y%29%282x-y%292%28x%2B5%29%28x-4%29-3%28x-6%29%28x%2B1%2913.25%26sup2)
-4x²+25=(5+2x)(5-2x)
(x+3y)(2x-y)=2x²-xy+6xy-y²=2x²+5xy-y²
2(x+5)(x-4)-3(x-6)(x+1)=2(x²+x-20)-3(x²-5x-6)=-x²+17x-22
13.25²-6.25²=(13.25+6.25)(13.25-6.25)=19.5*7=(20-0.5)*7=140-3.5=136.5
4x(a-b)-8y(b-a)=(4x+8y)(a-b)
(x+3y)(2x-y)=2x²-xy+6xy-y²=2x²+5xy-y²
2(x+5)(x-4)-3(x-6)(x+1)=2(x²+x-20)-3(x²-5x-6)=-x²+17x-22
13.25²-6.25²=(13.25+6.25)(13.25-6.25)=19.5*7=(20-0.5)*7=140-3.5=136.5
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