12x6/(12-7.2)-612x6/7.2-60.68x1.9 0.32x1.9
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12x6/(12-7.2)-61.2x6/7.2-6
=72/4..8-36.72/7.2-6
=15-5.1-6
=3.9
0.68x1.9+0.32x1.9
=（0.68+0.32）×1.9
=1×1.9
=1.9
=72/4..8-36.72/7.2-6
=15-5.1-6
=3.9
0.68x1.9+0.32x1.9
=（0.68+0.32）×1.9
=1×1.9
=1.9
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