用简便方法计算 (1)(3a-6b/a+b-(5a-6b/a-b)-(4a-5b/a+b)-(7a-8b/b-a) 第二题在下面(x-1)(X2+x+1)[(1/x-1)-(1/X2+X+1)+1/(1-x)(1+x+X2)还有:(3):一个人跑400m的速度比原来提高了1/10,时间比原来缩短了多少?(4
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/28 07:11:36
![用简便方法计算 (1)(3a-6b/a+b-(5a-6b/a-b)-(4a-5b/a+b)-(7a-8b/b-a) 第二题在下面(x-1)(X2+x+1)[(1/x-1)-(1/X2+X+1)+1/(1-x)(1+x+X2)还有:(3):一个人跑400m的速度比原来提高了1/10,时间比原来缩短了多少?(4](/uploads/image/z/2591494-70-4.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97+%EF%BC%881%EF%BC%89%283a-6b%2Fa%2Bb-%285a-6b%2Fa-b%29-%284a-5b%2Fa%2Bb%29-%287a-8b%2Fb-a%29+%E7%AC%AC%E4%BA%8C%E9%A2%98%E5%9C%A8%E4%B8%8B%E9%9D%A2%EF%BC%88x-1%29%28X2%2Bx%2B1%29%5B%281%2Fx-1%29-%281%2FX2%2BX%2B1%29%2B1%2F%281-x%29%281%2Bx%2BX2%EF%BC%89%E8%BF%98%E6%9C%89%EF%BC%9A%EF%BC%883%EF%BC%89%EF%BC%9A%E4%B8%80%E4%B8%AA%E4%BA%BA%E8%B7%91400m%E7%9A%84%E9%80%9F%E5%BA%A6%E6%AF%94%E5%8E%9F%E6%9D%A5%E6%8F%90%E9%AB%98%E4%BA%861%2F10%2C%E6%97%B6%E9%97%B4%E6%AF%94%E5%8E%9F%E6%9D%A5%E7%BC%A9%E7%9F%AD%E4%BA%86%E5%A4%9A%E5%B0%91%3F%EF%BC%884)
用简便方法计算 (1)(3a-6b/a+b-(5a-6b/a-b)-(4a-5b/a+b)-(7a-8b/b-a) 第二题在下面(x-1)(X2+x+1)[(1/x-1)-(1/X2+X+1)+1/(1-x)(1+x+X2)还有:(3):一个人跑400m的速度比原来提高了1/10,时间比原来缩短了多少?(4
用简便方法计算 (1)(3a-6b/a+b-(5a-6b/a-b)-(4a-5b/a+b)-(7a-8b/b-a) 第二题在下面
(x-1)(X2+x+1)[(1/x-1)-(1/X2+X+1)+1/(1-x)(1+x+X2)
还有:(3):一个人跑400m的速度比原来提高了1/10,时间比原来缩短了多少?
(4):(x/x-y)-(y/x-y)的结果是?
(5):已知1/a+1/b=1/a+b,则b/a+a/b等于多少?
第二题字母旁边的2是系数
我不会打抱歉
用简便方法计算 (1)(3a-6b/a+b-(5a-6b/a-b)-(4a-5b/a+b)-(7a-8b/b-a) 第二题在下面(x-1)(X2+x+1)[(1/x-1)-(1/X2+X+1)+1/(1-x)(1+x+X2)还有:(3):一个人跑400m的速度比原来提高了1/10,时间比原来缩短了多少?(4
(3a-6b)/a+b-(5a-6b/a-b)-(4a-5b/a+b)-(7a-8b/b-a)
=[(3a-6b)-(4a-5b)]/(a+b)-[(5a-6b)-(7a-8b)/(a-b)]
=-(a+b)/(a+b)+2(a-b)/(a-b)
=-1+2=1
第2题题目不对啊
1-1÷(1+10%)=1/11
(x/x-y)-(y/x-y)
=x-y
1/a+1/b=1/a+b
(a+b)ˇ2=ab
b/a+a/b=(aˇ2+bˇ2)/ab=【(a+b)ˇ2-2ab】/ab=-1