7.5×2.3-0.5×2.5 22.5×0.4简便计算?
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简便运算主要是通过交换律、结合律,将相关数字交换结合,凑成整数,达到速算目的。
7.5×2.3-0.5×2.5+22.5×0.4
=2.5×3×2.3-2.5×0.5+9×2.5×0.4
=2.5×6.9+2.5×3.6-2.5×0.5
=2.5×(6.9+3.6-0.5)
=2.5×10
=25
7.5×2.3-0.5×2.5+22.5×0.4
=2.5×3×2.3-2.5×0.5+9×2.5×0.4
=2.5×6.9+2.5×3.6-2.5×0.5
=2.5×(6.9+3.6-0.5)
=2.5×10
=25
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7.5×2.3-0.5×2.5+ 22.5×0.4
=2.5×(3×2.3)-0.5×2.5+ 2.5×(9×0.4)
=2.5×(6.9-0.5+3.6)
=2.5×10
=25
=2.5×(3×2.3)-0.5×2.5+ 2.5×(9×0.4)
=2.5×(6.9-0.5+3.6)
=2.5×10
=25
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7.5×2.3-0.5×2.5+22.5×0.4
=2.5×3×2.3-0.5×2.5+22.5×0.4
=2.5×(6.9-0.5)+22.5×0.4
=2.5×6.4+22.5×0.4
=16+9
=25
=2.5×3×2.3-0.5×2.5+22.5×0.4
=2.5×(6.9-0.5)+22.5×0.4
=2.5×6.4+22.5×0.4
=16+9
=25
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