0.9(17-X-2X)+0.7(2X)+0.5X=12.9怎么解?
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0.9(17-X-2X)+0.7(2X)+0.5X=12.9怎么解?
0.9(17-X-2X)+0.7(2X)+0.5X=12.9怎么解?
0.9(17-X-2X)+0.7(2X)+0.5X=12.9怎么解?
0.9(17-3X)+1.4X+0.5X=12.9
0.9(17-3X)+1.9X=12.9
15.3-2.7X+1.9X=12.9
2.4=0.8X
X=3
很简单!!
0.9(17-X-2X)+0.7(2X)+0.5X=12.9
等式两边同时乘以10,得
9(17-3X)+7(2X)+5X=129
153-27X+14X+5X=129
(-27+14+5)X=129-153
-8X=-24
X=3
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0.9(17-X-2X)+0.7(2X)+0.5X=12.9怎么解?
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