4.21-(6.75-2.76)-1.25的简便运算

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4.21-(6.75-2.76)-1.25的简便运算4.21-(6.75-2.76)-1.25的简便运算4.21-(6.75-2.76)-1.25的简便运算4.21-(6.75-2.76)-1.25=

4.21-(6.75-2.76)-1.25的简便运算
4.21-(6.75-2.76)-1.25的简便运算

4.21-(6.75-2.76)-1.25的简便运算
4.21-(6.75-2.76)-1.25
=4.21+2.76-(6.75+1.25)
=6.97-8
= -1.03

4.21-(6.75-2.76)-1.25
=4.21-6.75+2.76-1.25
=4.21+2.76-6.75-1.25
=(4.21+2.76)-(6.75+1.25)
=6.97-8
=-1.03