1 tính nhanh
a, 254 - 175 + 246 - 71
b, 1724 * 85 + 1724 * 25 - 1724 *10
3mu4 .5mu2 -128.2mu3 +1 mu 17
24-4mu2:4.2+ 3
`@` `\text {Ans}`
`\downarrow`
`3^4*5^2 - 128*2^3 + 1^17`
`= 9^2*5^2 - 2^7*2^3 + 1`
`= (9*5)^2 - 2^10+1`
`= 45^5-2^10 + 1`
`= 2025 - 1024 + 1`
`= 2025 - 1023`
`= 1002`
\(24-4^2\div4\cdot2+3\)
`= 24 - 4*2 + 3`
`= 24 - 8 + 3`
`= 24 - 5`
`= 19`
`@` `\text {Kaizuu lv u}.`
476-{5.[409-(8.3-21^2)]-1724}
776 -{5.[409-(8.3-21)2]-1724}
776 - { 5. [ 409 - (8.3 - 212)] - 1724}
= 776 - { 5.[ 409 - (24 - 441)] - 1724}
= 776 - { 5.[ 409 + 417] - 1724}
= 776 - {5. 826 - 1724}
= 776 - 2406
= - 1630
476 -{5.[409-(8.3-21^2)]-1724}
\(476-\left\{5.\left[409-\left(8.3-21^2\right)\right]-1724\right\}\)
\(=476-\left\{5.\left[409-\left(24-21\right)^2\right]-1724\right\}\)
\(=476-\left\{5.\left[409-3^2\right]-1724\right\}\)
\(=476-\left\{5.\left[409-9\right]-1724\right\}\)
\(=476-\left\{5.400-1724\right\}\)
\(=476-\left\{2000-1724\right\}\)
\(=476-276=200\)
D=500-{5.[409-(2^3 . 3 + 21)^2]-1724}
D = 500 - {5.[409 - (23 . 3 + 21)2] - 1724}
D = 500 - {5.[409 - (8 . 3 + 21)2] - 1724}
D = 500 - {5.[409 - (24 + 21)2] - 1724}
D = 500 - {5.[409 - 452] - 1724}
D = 500 - {5.[409 - 2025] - 1724}
D = 500 - {5.(-1616) - 1724}
D = 500 - {-8080 - 1724}
D = 500 - (-9804)
D = 500 + 9804
D = 10304
D=500-\(\left\{5\cdot[409-\left(2^3\cdot3+21\right)^2-1724\right\}\)=500-\(\left\{5\cdot[409-45^2-1724]\right\}\)
=500-\(\left\{5\cdot[409-2025-1724]\right\}\)=500-\(\left\{5\cdot\left(-3340\right)\right\}\)=500+16700=17200.
a) 17.(-25) + 25.21
b) 24.82+24.18-100
c) (-26)+48+(-34)+42
d) 476-{5.[409-(8.3-21)2 ]-1724}
làm ik mik tick nhìu cho
a) 17.(-25) + 25.21
= (-17).25 + 25.21
= 25.[(-17) + 21]
= 25.4
= 100
b) 24.82 + 24.18 - 100
= 24.(82 + 18) - 100
= 24.100 - 100
= 2400 - 100
= 2300
c) (-26) + 48 + (-34) + 42
= [(-26) + (-34)] + (48 + 42)
= (-60) + 90
= 30
d) 476 - {5.[409 - (8.3 - 21)2] - 1724}
= 476 - {5.[409 - (24 - 21)2] - 1724}
= 476 - {5.[409 - 32] - 1724}
= 476 - {5.[409 - 9] - 1724}
= 476 - {5.400 - 1724}
= 476 - {2000 - 1724}
= 476 - 276
= 200
Tỉm X
[1724-3x234]x[X-17]=0
Cho M=303-3.[655-(18:2+1). 4 3 +5]: 10 0 và N=500-[5.(409- 3 2 )-1724]. Chọn câu đúng.
A. M=N
B. M=N+1
C. M<N
D. M>N
476-{5x[409-(8x3-212)]-1724
Mng giải giúp mk với
Mng nhớ ghi từng bước thì mới đc tính là trả lời đúng nha!
476 - { 5x [ 409 - ( 8 x 3 - 212 ) ] - 1724
= 476 - { 5x [ 409 - ( 8 x 3 - 441 ) ] - 1724
= 476 - { 5x [ 409 - ( 24 - 441 ) ] - 1724
= 476 - { 5x [ 409 - ( - 417 ) ] - 1724
= 476 - { 5x [ 409 + 417 ) ] - 1724 }
= 476 - { 5x 826 - 1724 }
= 476 - { 4130 - 1724 }
= 476 - 2406
= - 1930