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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 5: Bài 8: Tìm x: a. (x + 1) + (x + 2) + (x + 3) + = + (x + 99) = 90387 b. (1 + 4 + 7 + ==.. + 100) : x =

Toán Lớp 5: Bài 8: Tìm x:
a. (x + 1) + (x + 2) + (x + 3) + ………… + (x + 99) = 90387
b. (1 + 4 + 7 + …………………….. + 100) : x = 17

Comments ( 1 )

  1. a, (x+1)+(x+2)+(x+3)+…+(x+99)=90387
    x+1+x+2+x+3+…+x+99=90387
    (x+x+x+…+x)+(1+2+3+…+99)=90387
    99x+4950=90387
    99x=90387-4950
    99x=85437
    x=85437:99
    x=863
    b,(1+4+7+…+100):x=17
    1717:x=17
    x=1717:17
    x=101
    Cho mk xin hay nhất please
    Thank you

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222-9+11+12:2*14+14 = ? ( )

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