X+8=13 2.5+X=5.3 X-2.7=13 X-40=15 X-1.6=1.4 X=5.3=10 求这几道题的方程要详细
问题描述：
X+8=13 2.5+X=5.3 X-2.7=13 X-40=15 X-1.6=1.4 X=5.3=10 求这几道题的方程要详细
答
x+8=13
x=13-8
=5
2.5+x=5.3
x+2.5=5.3
x=5.3-2.5
=2.8
x-2.7=13
x=13+2.7
=15.7
X-40=15
x=15+40
=55
x-1.6=1.4
x=1.4+1.6
=3
x-5.3=10
x=10+5.3
=15.3