18 × 12 ÷ 2
    (10 + 18) × 12 ÷2
    14 × 6.8- 7.6 × 6.8 ÷ 2
    7.6*6.8/2
    14*6.8
    5x +10(10-x)=90
    0.5×0.125×0.8×0.2
    20000×0.03×15+40000×0.03×14+60000×0.03×13+80000×0.03×12+100000×0.03×11+120000×0.03×10+140000×0.03×9+160000×0.03×8+180000×0.03×7+200000×0.03×6
    3*cos(5*x)+3-8*e^(-x)=0
    3*cos(5*x)+3-8*e(-x)=0
    3*cos(5*x)+3-8*e-x=0
    2x^3-2x^2+1=0
    27－25x－23e^（－2x）－25xe^（－2x）=0
    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)

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