:(2x+3)÷[X(X-1)(X-2)]=A÷X+B÷(X-1)+C÷(X-2) 求A B C 的值分别为多少
A÷X+B÷(X-1)+C÷(X-2)
=[A(X-1)(X-2)+BX(X-2)+CX(X-1)]÷[X(X-1)(X-2)]去括号合并同类项
分子=(A+B+C)X平方-(3A+2B+C)X+2A
所以A+B+C=0,-(3A+2B+C)=2.2A=3
所以A=1.5,B=-5,C=3.5
:(2x+3)÷[X(X-1)(X-2)]=A÷X+B÷(X-1)+C÷(X-2) 求A B C 的值分别为多少
A÷X+B÷(X-1)+C÷(X-2)
=[A(X-1)(X-2)+BX(X-2)+CX(X-1)]÷[X(X-1)(X-2)]去括号合并同类项
分子=(A+B+C)X平方-(3A+2B+C)X+2A
所以A+B+C=0,-(3A+2B+C)=2.2A=3
所以A=1.5,B=-5,C=3.5