用简便运算∶0.25x3.9=?

用简便运算∶0.25x3.9=?
2025-06-22 10:54:38
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回答1:

用简便运算∶0.25x3.9=?
0.25x3.9=
=0.25*4-0.25-0.1
=1-0.025
=0.975