Toán Lớp 7: tính
a, -3 mũ 10 x 15 mũ 5 / 25 mũ 3 x -9 mũ 7
b, 2 mũ 3 x 1/9 mũ 0 – 2 mũ -2 x 4 + ( -2 mũ 2 : 1/2 ) x 8
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Toán Lớp 7: tính
a, -3 mũ 10 x 15 mũ 5 / 25 mũ 3 x -9 mũ 7
b, 2 mũ 3 x 1/9 mũ 0 – 2 mũ -2 x 4 + ( -2 mũ 2 : 1/2 ) x 8
Comments ( 2 )
=(3^10×3^5×5^5)/(5^5× (-1).3^14)
=(3^15×5^5)/(5^5× (-1).3^14)
=3/-1
=-3
2^3× 1/1- 2^(-8)+(-2^3)×8
2^3×1 – 2^3. 2^(-5)+(-1).2^3×2^3
=2^3.[1-2^-5 +(-1)×1]
=8.[1-1/32+(-1)]
=8.[31/32+(-1)]
=8.(-1/32)
=-8/32
=-1/4
#helichange
