Question

怎么简算11乘58

还有12乘9.

Answer 1

一个数乘以11的简便算法：两边一拉，中间相加。满10向前一位进一。
如：23*11=253
58*11=638

Answer 2

你把58拆分成50+8； 11X 58 = 11 X ( 50 + 8) =11 X 50 + 11 X 8 =550 + 88 = 638
12拆成10 + 2 ； 12 X 9 = （10+2）X 9 = 10 X 9 + 2 X 9 =90 + 18 = 108
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Answer 3

11乘58
=(10+1)*58
=10*58+1*58
=580+58
=638
12乘9.

=12*(10-1)
=12*10-12*1
=120-12
=108

Answer 4

11×58
=(10+1)×58
=10×58+1×58
=580+58
=638

12×9
=12×(10-1)
=12×10-12×1
=120-12
=180

Answer 5

11*58
=（10+1）*58
=10*58+58
=580+58
=638
12×9
=12×(10-1)
=12×10-12×1
=120-12
=108