6.5X0.7+6.5X1.2+6.5
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6.5×0.7+6.5×1.2+6.5
=6.5×(0.7+1.2+1)
=6.5×2.9
=6.5×(3-0.1)
=6.5×3-6.5×0.1
=19.5-0.65
=18.85
=6.5×(0.7+1.2+1)
=6.5×2.9
=6.5×(3-0.1)
=6.5×3-6.5×0.1
=19.5-0.65
=18.85
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