(7.8÷0.13+6.5)-(2.1÷0.7×21)
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(160+6.5)-(3×21)
166.5-63
103.5
166.5-63
103.5
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1
(1)60+6.5=66.5
(2) 63
(1)-(2)=66.5 -63=3.5
(2) 63
(1)-(2)=66.5 -63=3.5
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