问题
解答题
(1)计算:(-1)3-|1-
(2)解方程:3(x-5)2=2(5-x) |
答案
(1)原式=-1+1-
+4×1-22 2
=-1+1-
+4-22 2
=4-3
;2
(2)∵3(x-5)2+2(x-5)=0,
∴(x-5)[3(x-5)+2]=0,
∴x-5=0或[3(x-5)+2]=0,
∴x1=5,x2=
.13 3
(1)计算:(-1)3-|1-
(2)解方程:3(x-5)2=2(5-x) |
(1)原式=-1+1-
+4×1-22 2
=-1+1-
+4-22 2
=4-3
;2
(2)∵3(x-5)2+2(x-5)=0,
∴(x-5)[3(x-5)+2]=0,
∴x-5=0或[3(x-5)+2]=0,
∴x1=5,x2=
.13 3