2.5×1.7+0.25×29-2.5×0.9等于多少?
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2.5×1.7+0.25×29-2.5×0.9
=2.5×1.7+2.5×2.9-2.5×0.9
=2.5×(1.7+2.9-0.9)
=2.5×3.7
=2.5×4-2.5×0.3
=10-0.75
=9.25
=2.5×1.7+2.5×2.9-2.5×0.9
=2.5×(1.7+2.9-0.9)
=2.5×3.7
=2.5×4-2.5×0.3
=10-0.75
=9.25
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原式=2.5×1.7+2.5×2.9-2.5×0.9
=2.5×(1.7+2.9-0.9)
=2.5×3.7
=9.25.
=2.5×(1.7+2.9-0.9)
=2.5×3.7
=9.25.
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