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

Toán Lớp 7: Tính nhanh nếu có thể a.N=(-3/5+4/9):7/11+(-2/5+5/9):7/11 b.P=6/7:(3/26-3/13)+6/7:(1/10-8/5)

Toán Lớp 7: Tính nhanh nếu có thể
a.N=(-3/5+4/9):7/11+(-2/5+5/9):7/11
b.P=6/7:(3/26-3/13)+6/7:(1/10-8/5)

Comments ( 1 )

  1. Giải đáp:
    a) N=0
    b) P=-8
    Lời giải và giải thích chi tiết:
    a) N=(-3/5+4/9):7/11+(-2/5+5/9):7/11
    =(-3/5+4/9)xx11/7+(-2/5+5/9)xx11/7
    =11/7xx[-3/5+4/9+(-2/5)+5/9]
    =11/7xx[(-3/5+(-2)/5)+(4/9+5/9)]
    =11/7xx((-5)/5+9/9)
    =11/7xx(-1+1)
    =11/7xx0
    =0
    b) P=6/7:(3/26-3/13)+6/7:(1/10-8/5)
    =6/7:(3/26-6/26)+6/7:(1/10-16/10)
    =6/7:((-3)/26)+6/7:((-15)/10)
    =6/7:((-3)/26)+6/7:((-3)/2)
    =6/7xx((-26)/3)+6/7xx((-2)/3)
    =6/7xx((-26)/3+(-2)/3)
    =6/7xx((-28)/3)
    =-8

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