1 tan17 1 tan18 1 tan27 1 tan28 without calculator 40

Updated on educate 2024-04-08
6 answers
  1. Anonymous users2024-02-07

    45. First of all, you need to know: tan(a+b)=tana+tanb 1-tana*tanbtan(a-b).

    So: tan17+tna28=tan(17+28)*(1-tan17*tan28)=1-tan17*tan28, original formula: (1+tan17+tan28+tan17tan28)(1+tan18+tan27+tan18tan17).

    1+tan17+tan28+tan17*tan28=21+tan18+tan27+tan18tan17=2, so the original formula = 2*2=4.

  2. Anonymous users2024-02-06

    Because tan45=tan(17+28)=(18+27), according to the textbook formula, we get: 1-tan17tan28=tan17+tan28 original formula = 2 2 = 4

  3. Anonymous users2024-02-05

    45. First know how to touch the way of God: tan(a+b)=tana+tanb dig and quarrel and 1-tana*tanbtan(a-b).

    So: tan17 + tna28 = tan(17 + 28) * (1-tan17 * tan28) = 1-tan17 * tan28, the original formula: judgment (1 + tan17 + tan28 + tan17tan28) (1 + tan18 + tan27 + tan18tan17).

    1+tan17+tan28+tan17*tan28=21+tan18+tan27+tan18tan17=2, so the original formula = 2*2=4.

  4. Anonymous users2024-02-04

    The details are as follows:Calculated according to the title:

    2axb=350x2=700

    ax3b=350x3=1050

    ax4）x（b÷4）=350

    a÷b）x（bx4）=350

    Multiplication Properties:Multiply the product of several numbers by a number, so that any factor in the product can be multiplied by this number, and then multiplied by other mountain rush numbers. For example:

    Multiplying the difference between the two numbers and a comma annihilation number can multiply the subtracted number and the subtracted number with this number respectively, and then answer Zheng to subtract the resulting product. For example: (137-125) 8=137 8-125 8=96.

  5. Anonymous users2024-02-03

    Written arithmetic, first written as a component sum, through the division, and then divided, with high accuracy.

  6. Anonymous users2024-02-02

    1) Chain bend log with 8 as the base x logarithm or draft = -2 3x = 8 (-2 3).

    x=1 shirt calls filial piety4

    2) log is based on x 27 logarithm = 3 4

    x^(3/4)=27

    x=3^4x=81

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