X×(1-2/5)+(72-X)×(1-5/9)=39
3个回答
X×(1-2/5)+(72-X)×(1-5/9)=39
3/5X+32-4/9X=39
3/5X-4/9X=39-32
7/45X=7
X=7÷7/45
X=45
相关问题
计算1.25×3.9×2.1÷(3.5×2.5×0.39),结果是______.
计算1.25×3.9×2.1÷(3.5×2.5×0.39),结果是______.
求(x 1)=x2x 11/2×2/3×3/4×4/5×…×9求(x 1)=x2x 11/2×2/3×3/4×4/5×…
1.(10.5x11.7x57×85)/(1.7×1.9×3×5×7×9×11×13×15)=?
(2014•江油市模拟)解方程(1)5×(1.2x-2)=2.5×(2x-3)(2)[2/9]×18-[1/4]x=1.
口算.0.4×3= 4.35×100= 3.5x+x= 0.72÷0.9= 9.85×0= 40×0.1= 32x-4x
5/6×3( )5/6 15×2/3( )2/3×15 39( )39×9/11 3/8×1/2( )3/8 (填大于号
解方程:5x/1×2+5x/2×3+5x/3×4+5x/4×5+.+5x/2003×2004+5x/2004×2005=
10×1/3x+5×2/3x+2/5(115-x)×10+3/5(115-x)×5
想知道:(x 1)=x2x 11/2×2/3×3/4×4/5×…×9想知道:(x 1)=x2x 11/2×2/3×3/4