问题
解答题
巧解密码: (1)(3X+2)+2[(X-1)-(2X+1)]=6 (2)若
|
答案
(1)(3X+2)+2[(X-1)-(2X+1)]=6,
3x+2+2(-x-2)=6,
3x+2-2x-4=6,
x-2=6,
x-2+2=6+2,
x=8;
(2)
X:7.5=0.16:11 2
,7 8
x×11 2
=7.5×0.16,7 8
x=1.2,15 16
x÷15 16
=1.2÷15 16
,15 16
x=1
,7 25
75×1
+8,7 25
=96+8,
=104.