X*0.89=112821.3
    x*0.89=112821.3
    2arctanx＝x
    2 × (8 × 8 + 8 × 5 + 8 × 8)
    18 × 18- 18 × (18- 5)
    1.2 × 0.6 + 2 × (1.2 × 0.8 + 0.6 × 0.8) =
    60 × 40 + 2 × (60 × 10 + 40 × 10)
    0.25*[8 × 6 + 2 × (8 × 3.5 + 6 × 3.5)- 22]
    8 × 6 + 2 × (8 × 3.5 + 6 × 3.5)- 22
    m1+m2+m2
    1*1*a
    x^3-4+8x-4x^2=0
    221×0.5×4150 ×10^（-6）
    -0.005*100^3
    -0.005*x^3
    226×0.8×57900×10^（-6）
    3-2(-5+1)^(1/3)=
    3-2(-2+1)^(1/3)=
    (1-(7/8))^(1/2)-(1/2)=
    (1-0)^(1/2)-(1/2)=

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