Toán Lớp 7: ( – 12 ) + 42 + ( – 10)
2 mũ4 x 5 – [131-(13-4) mũ 2]
31.32+32.69-700
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Toán Lớp 7: ( – 12 ) + 42 + ( – 10)
2 mũ4 x 5 – [131-(13-4) mũ 2]
31.32+32.69-700
Comments ( 1 )
( – 12 ) + 42 + ( – 10 )
= 30 + ( – 10 )
= 20
________________________
2^4 . 5 – [ 131 – ( 13 – 4 )^2 ]
= 16 . 5 – [ 131 – 9^2 ]
= 80 – [ 131 – 81 ]
= 80 – 50
= 30
________________________
31 . 32 + 32 . 69 – 700
= 32 . ( 31 + 69 ) – 700
= 32 . 100 – 700
= 3200 – 700
= 2500