先加括号简算345.567+78.57+12.34-7.83-128.34+21.43-2.17

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先加括号简算345.567+78.57+12.34-7.83-128.34+21.43-2.17先加括号简算345.567+78.57+12.34-7.83-128.34+21.43-2.17先加括号

先加括号简算345.567+78.57+12.34-7.83-128.34+21.43-2.17
先加括号简算345.567+78.57+12.34-7.83-128.34+21.43-2.17

先加括号简算345.567+78.57+12.34-7.83-128.34+21.43-2.17
345.567+78.57+12.34-7.83-128.34+21.43-2.17
=(12.34-128.34)-(7.83+2.17)+(78.57+21.43)+345.567
=-116-10+100+345.567
=-26+345.567
=319.567