Tính nhanh a) 12,7 + 12,7 + 12,7 + 12,7 x 8 – 12,7 b) 81,3 x 99 + 82 – 0,7 c) (100 + 42) x 42 + (200 – 58) x 58 d) 17,8 x 99 + 17 + 0,8 e) 103,7 x 101

Tính nhanh
a) 12,7 + 12,7 + 12,7 + 12,7 x 8 – 12,7
b) 81,3 x 99 + 82 – 0,7
c) (100 + 42) x 42 + (200 – 58) x 58
d) 17,8 x 99 + 17 + 0,8
e) 103,7 x 101 – 103 – 0,7
g) 124 x 76 + 12 x 248
h) 12,48 x 3,47 – 3,47 x 2,48
i) 128 x 68 + 16 x 256

0 bình luận về “Tính nhanh a) 12,7 + 12,7 + 12,7 + 12,7 x 8 – 12,7 b) 81,3 x 99 + 82 – 0,7 c) (100 + 42) x 42 + (200 – 58) x 58 d) 17,8 x 99 + 17 + 0,8 e) 103,7 x 101”

  1. Đáp án + Giải thích các bước giải:

    Ta có :

    `a,12,7+12,7+12,7+12,7.8-12,7`

    `=12,7(1+1+1+8-1)`

    `=12,7.10`

    `=127`

    `————`

    `b,81,3.99+82-0,7`

    `=81,3.99+(82-0,7)`

    `=81,3.99+81,3`

    `=81,3(99+1)`

    `=81,3.100`

    `=8130`

    `————-`

    `c,(100+42).42+(200-58).58`

    `=142.42+142.58`

    `=142(42+58)`

    `=142.100`

    `=14200`

    `————–`

    `d,17,8.99+17+0,8`

    `=17,8.99+(17+0,8)`

    `=17,8.99+17,8`

    `=17,8(99+1)`

    `=17,8.100`

    `=1780`

    `————–`

    `e,103,7.101-103-0,7`

    `=103,7.101-(103+0,7)`

    `=103,7.101-103,7`

    `=103,7(101-1)`

    `=103,7.100`

    `=10370`

    `————-`

    `g,124.76+12.248`

    `=124.76+12.2.124`

    `=124.76+24.124`

    `=124(76+24)`

    `=124.100`

    `=12400`

    `————-`

    `h,12,48.3,47-3,47.2,48`

    `=3,47(12,48-2,48)`

    `=3,47.10`

    `=34,7`

    `————-`

    `i,128.68+16.256`

    `=128.68+16.2.128`

    `=128.68+32.128`

    `=128(68+32)`

    `=128.100`

    `=12800`

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  2. a)`12,7+12,7+12,7+12,7×8-12,7`

    `=12,7×(1+1+1+8-1)`

    `=12,7×10`

    `=127`

    b)` 81,3×99+82-0,7`

    `=81,3×99+81,3`

    `=81,3×(99+1)`

    `=81,3×100`

    `=8130`

    c)`(100+42)×42+(200-58)×58`

    `=142×42+142×58`

    `=142×(42+58)`

    `=142×100`

    `=14200`

    d)` 17,8×99+17+0,8`

    `=17,8×99+17,8`

    `=17,8×(99+1)`

    `=17,8×100`

    `=1780`

    e)`124×76+12×248`

    `=124×76+24×124`

    `=124×(76+24)`

    `=124×100`

    `=12400`

    h)`12,48×3,47-3,47×2,48`

    `=3,47×(12,48-2,48)`

    `=3,47×10`

    `=34,7`

    i)`128×68+16×256`

    `=128×68+32×128`

    `=128×(68+32)`

    `=128×100`

    `=12800`

     

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