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\(a,\Rightarrow x+35=103\\ \Rightarrow x=68\\ b,\Rightarrow x+7=42\\ \Rightarrow x=35\\ c,\Rightarrow x-15=9\\ \Rightarrow x=24\\ d,\Rightarrow x+23=31\\ \Rightarrow x=8\\ e,\Rightarrow18-x=6\\ \Rightarrow x=12\\ f,\Rightarrow x+14=34\\ \Rightarrow x=20\\ g,\Rightarrow2x+1=21\\ \Rightarrow x=11\\ h,\Rightarrow3\left(x+1\right)=99\\ \Rightarrow x+1=33\Rightarrow x=32\\ i,5\left(x-3\right)=25\\ \Rightarrow x-3=5\\ \Rightarrow x=8\\ j,\Rightarrow8\left(2x+7\right)=88\\ \Rightarrow2x+7=11\Rightarrow x=2\\ k,\Rightarrow5\left(x+4\right)=85\\ \Rightarrow x+4=17\\ \Rightarrow x=13\)
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1) 125.(-24) + 24.225.
\(=24\left(-125+225\right)=24.100=2400.\)
2) 512.(2 – 128) – 128. (-512).
\(=512\left(2-128+128\right)=512.2=1024.\)
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a) – 1 < x < 49 18 => x ∈ {0;1;2}
b) − 1 24 < x 24 < 1 14 => x = 0
c) 2 3 ≤ x ≤ 26 5 => x ∈ {1;2;3;4;5}
d) 0 < x ≤ 1 => x = 1
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Thực hiện các phép tính hợp lý:
a. 17.32 + 17.69 – 17
= 17(32+69)-17
= 17.101 -17
= 1700
b. |316 – (25 – 19)2| : 56 + 19.5
= 316 – (25 – 19)2 : 56 +19.5 hoặc 316 + (25 + 19)2 : 56 +19.5
TH1 :316 – (25 – 19)2 : 56
= 316 - 12 : 56 +19.5
= 316 : 0,2 +19.5
= 1580 +19.5
= 1599.5
TH2 : 316 + (25 + 19)2 : 56 +19.5
= 316 + 88 : 56 +19.5
= 316 + 1 +19.5
= 336,5
Vậy S = { 159.5; 336.5}
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a: =(21-11)+(22-12)+(23-13)+(24-14)
=10+10+10+10
=40
b: =(34-14)+(35-15)+(36-16)+(37-17)
=20+20+20+20
=80
a)5.22.23-4(58:56)
=5.4.8-4.52
=20.8-4.25
=20.8-100
=160-100
=60
b)5.35:(38:35)-23.5
=5.35:33-23.5
=5.(35:33)-23
=5.32-23
=5.9-8
=45-8
=37
Cho mk 1 tk nha