8.84×2.5-0.84简便运算
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8.84×2.5-0.84
=(8+0.84)x2.5-0.84
=8x2.5+0.84x2.5-0.84
=20+0.84x(2.5-1)
=20+0.84x2.5-0.84x1
=20+2.1-0.84
=21.26。
=(8+0.84)x2.5-0.84
=8x2.5+0.84x2.5-0.84
=20+0.84x(2.5-1)
=20+0.84x2.5-0.84x1
=20+2.1-0.84
=21.26。
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