Toán Lớp 7: Thực hiện phép tính
a, 8. (-1/2) mũ 2
b, 5,3.4,7+(-1,7) .5,3-5,9
c, 2/3+-1/3+7/15
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Toán Lớp 7: Thực hiện phép tính
a, 8. (-1/2) mũ 2
b, 5,3.4,7+(-1,7) .5,3-5,9
c, 2/3+-1/3+7/15
Comments ( 2 )
8.(-1/2)^2
=8 . (-1)^2/2^2
=8. 1/4
=8/4
=2
b)
5,3.4,7+(-1,7).5,3-5,9
=5,3.(4,7-1,7)-5,9
=5,3.3-5,9
=15,9-5,9
=10
c)
2/3+(-1)/3+7/15
=2/3-1/3+7/15
=1/3+7/15
=5/15+7/15
=12/15
=4/5