7X-3×9=29 4X+0.5×8=15 9X-1.3×0.6=26.22 5.8-5.8*0.5=5x-1.91
问题描述：
7X-3×9=29 4X+0.5×8=15 9X-1.3×0.6=26.22 5.8-5.8*0.5=5x-1.91
答
(1)7X-3×9=297x-27=29 7x=27+297x=56 x=8(2)4X+0.5×8=15 4x+4=154x=15-44x=11 x=11/4(3)9X-1.3×0.6=26.22 9x-0.78=26.22 9x=26.22+0.789x=27 x=3(4)5.8-5.8*0.5=5x-1.915.8-...