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a, 36:(x–5) = 2 2
(x–5) = 9
x = 14
b, [3.(70–x)+5]:2 = 46
[3.(70–x)+5] = 92
70–x = 29
x = 41
c, 450:[41–(2x–5)] = 3 2 .5
41–(2x–5) = 10
2x–5 = 31
2x = 36
x = 18
d, 230+[ 2 4 +(x–5)] = 315. 2018 0
16+(x–5) = 315–230
x–5 = 85–16
x = 69+5
x = 74
e, 2 x + 2 x + 1 = 48
2 x .(2+1) = 48
2 x = 16 = 2 4
x = 4
f, 3 x + 2 + 3 x = 2430
3 x . 3 2 + 1 = 2430
3 x = 2430:10 = 243 = 3 5
x = 5
\(\left(-48\right).54+\left(-48\right).46+480\)
\(=\left(-48\right).\left(54+46\right)+480\)
\(=\left(-48\right).100+480\)
\(=-4800+480\)
\(=-4320\)
_________
\(900:\left[50+\left(7^2-8.3\right).2\right]+2022^0\)
\(=900:\left[50+\left(49-24\right).2\right]+1\)
\(=900:\left[50+25.2\right]+1\)
\(=900:\left[50+50\right]+1\)
\(=900:100+1\)
\(=9+1=10\)
46 - ( x - 11 ) = - 48
X - 11 = 46 - ( - 48 )
X - 11 = 46 + 48
X - 11 = 94
X = 94 + 11
X = 105
Vậy x = 105
48 : 46 - 5 . [ ( -37 )-(-24-37) ] + 20220
=42-5(-37+24+37)+1
=16-5.24+1
=16-120+1
=-103
\(4^8:4^6\) \(-5.[(-37)-(-24-37)]+\) \(2022^o.\)
\(=4^2-5.\left(-37+24+37\right)+1.\)
\(=16-5.24+1.\\ =-103.\)
36 + 48 + 40 + 42 + 44 + 46 + 48 + 50
= (36 + 48) + (40 + 50) + (42 + 48) + (44 +46)
= 84 + 90 + 90 + 90
= 74 + 90 \(\times\) 3
= 74 + 270
= 344
36 + 38 + 40 + 42 + 44 + 46 + 48 + 50
= (36 + 50){ (50-36):2+1}: 2
= 344
\(48-\left(-3x\right)=-46-\left(-458\right)\\ \Rightarrow48+3x=-46+458\\ \Rightarrow48+3x=412\\ \Rightarrow3x=412-48\\ \Rightarrow3x=364\\ \Rightarrow x=\dfrac{364}{3}\)
⇔48+3x=-46+458
⇔48+3x=412
⇔3x=364
⇔x=364/3