7.8X+7.2X=45
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7.8X+7.2X=457.8X+7.2X=457.8X+7.2X=457.8X+7.2X=4515X=45X=37.8X+7.2X=45(7.8+7.2)X=4515X=45X=315X=45X=3
7.8X+7.2X=45
7.8X+7.2X=45
7.8X+7.2X=45
7.8X+7.2X=45
15X=45
X=3
7.8X+7.2X=45
(7.8+7.2)X=45
15X=45
X=3
15X=45
X=3
7.8X+7.2X=45
15X=45
X=3
7.8X+7.2X=45
15X=45
X=3
7.8X+7.2X=45
7.2x-3.2x-7.8=12.
(X+X)+(X-X)+(X*X)+(X/X)=100
x-20%x=45+20%x
X-35%X=7.8 X+160%X=39
7x-x=7.2
x-20%x=7.2
7x-x=7.2
1.8x-7.2=x
x-0.48x=7.2
x-0.8x=7.2
7.8X-X=14.
(3.6+x)*60%=7.2 x+30%x=90%x+30 45%+(9.6-x)=5.73.6+x)*60%= 7.2 x+30%x=90%x+30 45%+(9.6-x)=5.7
x*x*x*x*x=80000?
x+45%x=52.2
X+X×X=56 (X+2)-(X×X+7)=-45 X+a=105 X=?a=?
解方程 x+20%x= x-45%x= 75%x+43%x=
(x-5)+(x-3)+x+(x+3)+(x+5)=45,x等于?