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9/10×67.8加54.3÷1又1/9−221×9%?
9/10×67.8加54.3÷1又1/9−221×9%
=0.9x67.8+54.3x0.9-221x0.09
=0.9x67.8+54.3x0.9-22.1x0.9
=0.9x(67.8+54.3-22.1)
=0.9x100
=90
9/10×67.8加54.3÷1又1/9−221×9%
=0.9x67.8+54.3x0.9-221x0.09
=0.9x67.8+54.3x0.9-22.1x0.9
=0.9x(67.8+54.3-22.1)
=0.9x100
=90
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