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

Toán Lớp 6: Tính hợp lý nếu có thể a) 2018 mũ 0 – { 15 mũ 2 : [ 175+(2 mũ 3 × 5 mũ 2 – 6 × 25)]} b) 5 mũ 2 × 2 – 3 mũ 2 × 4 c) 58×75 + 58 ×50 -58×

Toán Lớp 6: Tính hợp lý nếu có thể
a) 2018 mũ 0 – { 15 mũ 2 : [ 175+(2 mũ 3 × 5 mũ 2 – 6 × 25)]}
b) 5 mũ 2 × 2 – 3 mũ 2 × 4
c) 58×75 + 58 ×50 -58×25
d) 107-{38+[7×3 mũ 2 – 24 : 6 + (9-7) mũ 3 ]}:15
e) (-23) + 13 +(-17) + 57

Comments ( 1 )

  1. a ) 2018 mũ 0 – { 15 mũ 2 : [ 175 + ( 2 mũ 3 x 5 mũ 2 – 6 x 25 ) ] }
    = 1 – { 225 : [ 175 + ( 8 x 25 – 6 x 25 ) ] }
    = 1 – { 225 : [ 175 + 25 x ( 8 – 6 ) ] }
    = 1 – [ 225 : ( 175 + 25 x 2 ) ]
    = 1 – [ 225 : ( 175 + 50 ) ] = 1 – ( 225 : 225 ) = 1 – 1 = 0 
    b ) 5 mũ 2 x 2 – 3 mũ 2 x 4
    = 25 x 2 – 9 x 4 = 25 x 2 – 9 x 2 x 2 = 25 x 2 – 18 x 2 = ( 25 – 18 ) x 2 = 7 x 2 = 14
    c ) 58 x 75 + 58 x 50 – 58 x 25
    = 58 x ( 75 + 50 – 25 ) = 58 x 100 = 5800 
    d ) 107 – { 38 + [ 7 x 3 mũ 2 – 24 : 6 + ( 9 – 7  ) mũ 3 ] } : 15
    = 107 – [ 38 + ( 7 x 9 – 4 + 2 mũ 3 ) ] : 15
    = 107 – [ 38 + ( 63 – 4 + 8 ) ] : 15 = 107 – ( 38 + 67 ) : 15 = 107 – 105 : 15 = 107 – 7 = 100
    e ) ( -23 ) + 13 + ( -17 ) + 57
    = ( -10 ) + 40 = 30
     

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

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