简便运算,4.5x98、3.6x0.25、7.5x102

2024-12-01 17:36:09
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回答(1):

4.5x98
=4.5x(100-2)
=4.5x100-4.5x2
=450-9
=441
3.6x0.25
=0.9x(4x2.5)
=0.9x1
=0.9
7.5x102
=7.5x(100+2)
=7.5x100+7.5x2
=750+15
=765