4X加30%X=12.9
问题描述:
4X加30%X=12.9
答
4X+30%X=12.9
4X+0.3X=12.9
4.3X=12.9
X=3
4X加30%X=12.9
4X+30%X=12.9
4X+0.3X=12.9
4.3X=12.9
X=3