1.21*42-2.42*12简便计算
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![1.21*42-2.42*12简便计算](/uploads/image/z/66864-48-4.jpg?t=1.21%2A42-2.42%2A12%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
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1.21*42-2.42*12简便计算
1.21*42-2.42*12简便计算
1.21*42-2.42*12简便计算
1.21×42-2.42×12
=2.42×21-2.42×12
=2.42×﹙21-12﹚
=2.42×9
=2.42×﹙10-1﹚
=2.42×10-2.42
=24.2-2.42
=21.78
收起
1.21*42-2.42*12=1.21x2x21-2.42x12=2.42(21-12)=2.42x9=21.78