4.75—9.64+(8.25―1.36)
=（4.75+8.25）—（9.64+1.36)
=13 - 11
= 2why4.75—9.64+(8.25―1.36)=4.75 +8.25 - 9.64 -1.36=（4.75+8.25）—（9.64+1.36)=13 - 11= 2
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