42,1×34−2,1×34=34(42,1-2,1)=34×40=1360
42,1 × 34 - 2,1 × 34 = 34 × (42,1 - 2,1) = 34 × 40 = 1360
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42,1×34−2,1×34=34(42,1-2,1)=34×40=1360
42,1 × 34 - 2,1 × 34 = 34 × (42,1 - 2,1) = 34 × 40 = 1360