
展开全部
2.45x11x2.45
=(2.45x10+2.45x1)x2.45
=(24.5+2.45)x2.45
=26.95x2.45
=30x2.45-3x2.45-0.05x2.45
=73.5-7.35-0.1225
=73.5-7.4725
=66.0275
=(2.45x10+2.45x1)x2.45
=(24.5+2.45)x2.45
=26.95x2.45
=30x2.45-3x2.45-0.05x2.45
=73.5-7.35-0.1225
=73.5-7.4725
=66.0275
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