解方程:8(X-2)=2(X+7) 200X+50X(22-X)=1400
问题描述:
解方程:8(X-2)=2(X+7) 200X+50X(22-X)=1400
答
8(X-2)=2(X+7)
8x-16=2x+14
6x=30
x=5
200X+50X(22-X)=1400
200x+1100-50x=1400
150x=300
x=2
答
8(X-2)=2(X+7)8x-16=2x+146x=30x=5一楼的50后面不是乘号是x200X+50X(22-X)=140020x+5x(22-x)=14020x+110x-5x^2=1405x^2-130x+140=0x^2-26x+28=0x^2-26x+169-141=0(x-13)^2=141x-13=根号141或-根号141x=13+根号...