2X+4(9-X)=26
问题描述:
2X+4(9-X)=26
2X+4(9-X)=26 X=5
答
2X+<(4×9)-(4X)>=26
2X 36-4X=26
2X 36-26=4X
2X 10=4X
4X-2X=10