87*23+19*93+70*87 295-(31-2^2*5)^2 0:ích=0 2 mũ ích :2^5=1

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87*23+19*93+70*87
295-(31-2^2*5)^2
0:ích=0
2 mũ ích :2^5=1

0 thoughts on “87*23+19*93+70*87 295-(31-2^2*5)^2 0:ích=0 2 mũ ích :2^5=1”

  1. Đáp án:

    `a) 9858.`

    `b) 174.`

    `c) 0.`

    `d) 5.`

    Giải thích các bước giải:

    `a) 87 × 23 + 19 × 93 + 70 × 87.`

    `= (87 × 23 + 70 × 87) + 19 × 93.`

    `= 87 × (23 + 70) + 19 × 93.`

    `= 87 × 93 + 19 × 93.`

    `= (87 + 19) × 93.`

    `= 106 × 93.`

    `= 9858.`

    `b) 295 – (31 – 2^2 × 5)^2.`

    `= 295 – (31 – 4 × 5)^2.`

    `= 295 – (31 – 20)^2.`

    `= 295 – 11^2.`

    `= 295 – 121.`

    `= 174.`

    `c) 0 ÷ x = 0.`

    `⇒ x = 0.`

    `d) 2^x ÷ 2^5 = 1.`

    `⇒ 2^{x – 5} = 1.`

    `⇒ 2^{x – 5} = 2^0.`

    `⇒ x – 5 = 0.`

    `⇒ x = 5.`

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