99.5X2.7-5.4X0.25?
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99.5×2.7-5.4×0.25
=99.5×2.7-(2.7×2)×0.25
=99.5×2.7-2.7×(2×0.25)
=99.5×2.7-2.7×0.5
=(99.5-0.5)×2.7
=99×2.7
=267.3
=99.5×2.7-(2.7×2)×0.25
=99.5×2.7-2.7×(2×0.25)
=99.5×2.7-2.7×0.5
=(99.5-0.5)×2.7
=99×2.7
=267.3
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