1.(x/4)^2+(56-x/4)^2=100
问题描述:
1.(x/4)^2+(56-x/4)^2=100
2.(x/4)^2+(56-x/4)^2=196
3.(x/4)^2+(56-x/4)^2=200
4.10t+3t^2=200
5.(92-2x)(60-x)=885乘以6
6.x^2+(x+1)^2=7^2
7.(100+x)(1000-2x)=1000乘以100乘以(1+百分之15点2)
答
(1)(X/4)^2+[(56-X)/4]^2=100两边乘16x^2+(56-x)^2=1600化简x^2+56^2+x^2-112x=16002x^2+3136-112x=1600两边除2x^2-56x+768=0因式分解(x-32)(x-24)=0于是x=32或x=24 (2)(x/4)^2+[(56-x)/4]^2=196x^2+(56-x)^2=1...