解方程12X-5.6*9=81.6 8X-4*72=0

解方程12X-5.6*9=81.6 8X-4*72=0
解方程12X-5.6*9=81.6 8X-4*72=0

解方程12X-5.6*9=81.6 8X-4*72=0
12X-5.6*9=81.6
12X-50.4=81.6
12X=50.4+81.6
12X=132
X=132/12
X=11
8X-4*72=0
8X=288
X=288/8
X=36

12X-5.6*9=81.6
12x-50.4=81.6
12x=81.6+50.4
12x=132
x=11
8X-4*72=0
8x=288
x=36

12X-5.6×9=81.6
12x-50.4=81.6
12x=30.2
x≈2.517
8X-4×72=0
8x-288=0
8x=288
x=36

12X-5.6*9=81.6
12x=81.6+50.4
12x=87
x=87/12
8X-4*72=0
8x=288
x=36

2X-5.6×9=81.6
12X-50.4=81.6
12X=50.4+81.6
12X=132
X=132÷12
X=11
8X-4×72=0
8X=288
X=288÷8
X=36
望采纳