4个回答
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展开全部
7.5x2.3+1.9x2.5+12.5x0.4
=2.5x3x2.3+1.9x2.5+2.5x5x0.4
=2.5x(6.9+1.9+2)
=2.5x10.8
=2.5x(10+0.8)
=2.5x10+2.5x0.8
=25+2
=27
=2.5x3x2.3+1.9x2.5+2.5x5x0.4
=2.5x(6.9+1.9+2)
=2.5x10.8
=2.5x(10+0.8)
=2.5x10+2.5x0.8
=25+2
=27
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2.5×4.5×12.5
=(2.5×4)×(4.5×2)×(12.5×8)÷(4×2×8)
=10×9×100÷64
=9000÷64
=140.625
=(2.5×4)×(4.5×2)×(12.5×8)÷(4×2×8)
=10×9×100÷64
=9000÷64
=140.625
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展开全部
=(2.5×4)×(4.5×2)×(12.5×8)÷(4×2×8)
=10×9×100÷64
=9000÷64
=140.625
=10×9×100÷64
=9000÷64
=140.625
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