Mathematics
         
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Mathematical calculation:
    Enter the mathematical formula directly and click the "Next" button to get the calculation answer.
    It supports mathematical functions (including trigonometric functions).
    Current location:Mathematical operation > History of Mathematical Computation
     21×9= 28×9= 40×5=
    20×4= 22×5= 20×7= 21×8= 8×60= 20×6= 8×70= 32×7= 12×8= 21×9= 28×9= 40×5=
    24×2= 90×8= 6×29= 20×9= 24×8= 42×6= 50×3= 27×3= 50×4=
    20×3= 3×50= 7×60= 23×6= 80×6= 20×7= 21×7= 3×90= 8×20=
     40×5= 80×2= 23×3=
    arccos(0.222521)*7/3.14
    6×50= 22×5= 70×8= 30×9= 70×9= 40×6= 27×8= 23×2= 7×50= 40×5= 80×2= 23×3=
    22×3= 20×3= 22×4= 70×5= 22×6= 70×6= 2×80= 70×7= 2×90=
    80×9= 20×9= 40×9= 22×6= 83×6= 22×2= 2×90= 30×8= 6×30=
    arccos(0.939693)/3.14*9
    arccos(0.939693)/3.14*11
     12×2= 19×6= 31×7=
    11×4= 13×3= 21×7= 61×9= 8×51= 53×6= 8×61= 65×7= 62×7= 12×2= 19×6= 31×7=
    15×1= 71×8= 1×20= 16×9= 15×6= 13×2= 41×3= 16×3= 41×4=
    arccos(-0.773409)*7/3.14
    arccos(-0.773409)*7
    arccos(-0.773409)
    51×7= 3×41= 7×51= 14×1= 71×6= 16×7= 12×3= 3×81= 8×51=
    6×41= 43×3= 61×8= 21×9= 61×9= 31×6= 18×1= 65×2= 7×41= 35×5= 71×2= 14×2=
    13×3= 11×3= 73×4= 61×5= 13×1= 61×6= 2×71= 61×7= 2×81=

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