7.5*2.3+1.9*2.5 用简便方法
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7.5×2.3+1.9×2.5
=2.5×3×2.3+1.9×2.5
=2.5×6.9+1.9×2.5
=2.5×(6.9+1.9)
=2.5×(7-0.1+2-0.1)
=2.5×(9-0.2)
=2.5×8.8
=2.5×4×2.2
=10×2.2
=22
=2.5×3×2.3+1.9×2.5
=2.5×6.9+1.9×2.5
=2.5×(6.9+1.9)
=2.5×(7-0.1+2-0.1)
=2.5×(9-0.2)
=2.5×8.8
=2.5×4×2.2
=10×2.2
=22
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展开全部
7.5*2.3+1.9*2.5
=2.5*6.9+1.9*2.5
=2.5*(6.9+1.9)
=2.5*(8+0.1)
=2.5*8+2.5*0.1
=20+0.25
=20.25
=2.5*6.9+1.9*2.5
=2.5*(6.9+1.9)
=2.5*(8+0.1)
=2.5*8+2.5*0.1
=20+0.25
=20.25
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