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①2.67+5.04+1.9
②21.43-2.74-5.26
③7.49-(0.56+2.8)
④4.8-1.74+2.06
⑤15.25+7.3+4.75+3.7
⑥17.13-3.82-4.06
①16+4÷( - )
②1.7+3.98+2.3
③( + )× +
④1÷
⑤4.8×3.9+6.1×4.8
3.52+4.8+3.48+5.2=
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