7.8-(9.6-2.2)简便运算

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7.8-(9.6-2.2)简便运算
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7.8-(9.6-2.2)简便运算
7.8-(9.6-2.2)简便运算

7.8-(9.6-2.2)简便运算

7.8-9.6+2.2

=7.8-9.6+2.2
=7.8+2.2-9.6
=10-9.6
=0.4

去括号,
7.8-9.6+2.2=10-9.6=0.4

10-9.6