Toán Lớp 6: 1. 100 – {80 -[70- ( 30 – 25 mũ 2 ) ] }
b. 100 mũ 9 : 100 mũ 8 + 2021 mũ 2020 : 2020 mũ 0
2. Tìm x
a, 20 + 2.x = 10 mũ 3 : 10 mũ 2 + 12 mũ 2 : 12 + 2
b. 5.x – 10 = 5 mũ 5 : 5 mũ 4
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Toán Lớp 6: 1. 100 – {80 -[70- ( 30 – 25 mũ 2 ) ] }
b. 100 mũ 9 : 100 mũ 8 + 2021 mũ 2020 : 2020 mũ 0
2. Tìm x
a, 20 + 2.x = 10 mũ 3 : 10 mũ 2 + 12 mũ 2 : 12 + 2
b. 5.x – 10 = 5 mũ 5 : 5 mũ 4
Comments ( 2 )
a)100 – {80 -[70- ( 30 – 25^2 ) ] }
=100 – {80 -[70- ( 30 – 625 ) ] }
=100 – {80 -[70- (-529) ] }
=100 – {80 -[70+529 ] }
=100 – {80 -599 }
=100 – -519
=619
b) 100^9 : 100^8 + 2021^2020 : 2020^0
=100^(9-8) + 2020^2021:1
=100^1 + 2020^2021
2)
a)20 + 2.x = 10^3 : 10^2 + 12^2 : 12 + 2
20 + 2.x = 10^(3 -2) + 12^(2-1)
20 + 2.x = 10+12
2.x = 22-20
x = 2:2
x=1
b)5.x – 10 = 5^5 : 5^4
5.x – 10 = 5^(5-4)
5.x – 10 = 5
5.x= 5+10
x= 15:5
x=3