Toán Lớp 6: a) 47 – [(45.24 – 5MŨ2.12):14] e) 10 – [(8MŨ 2 – 48).5 + (2MŨ3.1 + 8) -12] : 28
b) 2010 – 2000 : [486 – 2(7MŨ2 – 6)] g) 128 – [68 + 8(37 – 35)MŨ 2] : 4
c) 568 – {5[143 – (4 – 1)MŨ HAI] + 10} : 10
d) 307 – [(180 – 160) : 2MŨ 2 + 9] : 2 h) 205 – [1200 – (4MŨ 2 – 2.3)MŨ 3] : 40
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= 47-[(1080 – 300):14]
= 47-[780:14]
= 47- 55 5/7
= -8 5/7
b) 2010-2000:[486-2(7^2-6)]
= 2010-2000:[486-2(49-6)]
= 2010-2000:[486-2.43]
= 2010-2000:[486-86]
= 2010-2000:400
= 2010-5
= 2005
c) 568-{568 – {5[143 – (4 – 1)^2] + 10} : 10
= 568 – {5[143 – 9] + 10} : 10
= 568 – {5.134+10}:10
= 568 – {670+10}:10
= 568 – 680 :10
= 568 – 68
= 500
d) 307 – [(180 – 160) : 2^2 + 9] : 2
= 307- [(180-160):4+9]:2
= 307- [20:4+9]:2
= 307- [5+9]:2
= 307- 14:2
= 307- 7
= 300
e) 10 – [(8^2 – 48).5 + (2^3.1 + 8)]
= 10 – [(64-48).5+(8.1+8)]
= 10 – [16.5+(8+8)]
= 10 – [80+16]
= 10 – 96
= -86
g) 128 – [68 + 8(37 – 35)^2] : 4
= 128 – [68+8.4]:4
= 128 – [68+32]:4
= 128 – 100:4
= 128 – 25
= 128 – 25
= 103
h) 205 – [1200 – (4^2 – 2.3)^3] : 40
= 205 – [1200-1000]:40
= 205 – 200:40
= 205 – 5
= 200
Không hiểu gì em hỏi lại chị nhé!
Chúc em học tốt nha^^!