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`-214-[(117-x)-314]=0`
`=> -214-(117-x-314)=0`
`=> -214-117+x+314=0`
`=> x-17=0`
`=> x=0+17`
`=> x=17`
\(-214-[\left(117-x\right)-314]\text{=}0\)
\(-214-\left(117-x-314\right)\text{=}0\)
\(-214-117+x+314\text{=}0\)
\(x-17\text{=}0\)
\(x\text{=}17\)
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a)197-9(x+3)=80
=>9(x+3)=197-80
=>9(x+3)=117
=>x+3=117:9
=>x+3=13
=>x=13-3=10
b)7(x-14)+35=56
=>7(x+14)=56-35
=>7(x+14)=21
=>x+14=21/7
=>x+14=3
=>x=3-14=(-11)
c)2.3x-1=54
=>3x-1=54:2
=>3x-1=27
=>3x-1=33
=>x-1=3
=>x=3+1=4
d)3.2x-1=24
=>2x-1=24:3
=>2x-1=8
=>2x-1=23
=>x-1=3
=>x=3+1=4
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A = 51 − 314 + 213 ; A = 51 − 314 − 213 B = 51 + 213 − 314 ; C = 51 + 314 − 213 ; D = 51 + 213 − 314 ; D = 51 + 213 − 314 E = 51 − 314 − 213 ; E = 51 − 314 + 213 F = 51 − 213 − 314. V ậ y A = F ; B = E = D
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a) 5 13 + − 5 7 + − 20 41 + 8 13 + − 21 41 = 5 13 + 8 13 + − 20 41 + − 21 41 + − 5 7 = − 5 7
b) 1 28 + − 1 14 + 3 28 + − 1 7 + 3 14 = 1 28 + 3 28 + − 1 14 + 3 14 + − 1 7 = 1 7
c) 1 2 + − 2 3 + 3 4 + − 4 5 + 5 6 + − 5 6 + 4 5 + − 3 4 + 2 3 + − 1 2 = 1 2 + − 1 2 + 3 4 + − 3 4 + − 4 5 + 4 5 + 5 6 + − 5 6 = 0
![](https://rs.olm.vn/images/avt/0.png?1311)
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a) ( -2 ).8. ( 5 )2 .( -3 )2.( -5 )
= (-2). 8. 25. (-9). (-5)
= -18000
b) ( 256 – 197) – ( 185 + 156 – 197 )
= 256 -197 -185 -156 +197
= (256-156) + (-197+197) -185
= 100 - 185
= -85
c)18 . 13 – 3 . 6 . 10
= 3.6.13 - 3.6.10
= 3.6.(13-10)
= 18 . 3
= 54
d) 125. 64 + (- 64) . 55 + 60. (- 164)
= 125.64+ 64. (-55) + 60. [(-100) + (-64)]
= 125.64 + 64.(-55)+ 60.(-100)+60.(-64)
= [125+ (-55) + (-60)] . 64 + (-6000)
= 10.64 + (-6000)
= 640+(-6000)
= -5360
Đáp án cần chọn là: D