1.2345×0.2345×2.469-1.2345³-1.2345×0.2345²
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1.2345×0.2345×2.469-1.2345³-1.2345×0.2345²1.2345×0.2345×2.469-1.2345³-1.2345×0.2345&#
1.2345×0.2345×2.469-1.2345³-1.2345×0.2345²
1.2345×0.2345×2.469-1.2345³-1.2345×0.2345²
1.2345×0.2345×2.469-1.2345³-1.2345×0.2345²
这么简单?我也是初一的 设1.2345为a 你们应该学了因式分解了吧,你把a带进去就可以算了.
1.2345×0.2345×2.469-1.2345³-1.2345×0.2345²
=1.2345*(0.2345*2.469-1.2345^2-0.2345^2)
=-1.2345*(1.2345-0.2345)^2
=-1.2345*1^2
=-1.2345
令x=1.2345
x*(x-1)*(2x) - x^3 - x*(x-1)^2
=x*(x-1)*(2x-x+1) - x^3
=x*(x-1)*(x+1) - x^3
=x*(x^2-1)-x^3
=(x^3-x)-x^3
=-x
=-1.2345我才初一，看不懂、、、、、原式 = 1.2345*(0.2345×2.469-1.2345&...
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令x=1.2345
x*(x-1)*(2x) - x^3 - x*(x-1)^2
=x*(x-1)*(2x-x+1) - x^3
=x*(x-1)*(x+1) - x^3
=x*(x^2-1)-x^3
=(x^3-x)-x^3
=-x
=-1.2345
收起
计算1.2345*0.2345*2.469-1.2345^3-1.2345*0.2345^2
1.2345×0.2345×2.469-1.2345³-1.2345×0.2345²
1.2345*0.2345*2.469-1.2345³-1.2345*0.234² 等于-1.2345,咋算的?
1.2345*0.2345*3-1.2345平方+0.7655*0.469
1.2345²+0.7655²+2.469×0.7655
计算1.2345²+2.469×0.7655+0.7655²
1.2345^2+0.7655^2+2.469X0.7655
求:1.2345^2+2.469*0.7655+0.7655^2 用公式法
1.2345的平方+07655的平方+2.469乘0.7655
1.2345^2+0.7655^2+2.469*0.7655,求详细过程,谢谢!
1.2345²＋2.469×0.7655＋0.7655²=?
1.2345的平方+0.7655的平方+2.469乘0.7655=?
1.2345²＋0.7655²＋2.469×0.7655
1.2345²＋2.469×0.7655＋0.7655²＝?
1.2345²+0.7655²+2.469×0.7655求答案啊,
1.2345^2+0.7655^2+2.469x0.7655=?
初一简便计算1.2345^2+0.7655^2+2.469*0.7655
计算题:1.2345^5+0.7655^2+2.469*0.76552345^5+0.7655^2+2.469*0.7655