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=>X.15+x +15=463.
=>X.(15+1)+15=463
=>X.16+15=463
=>X.16=448
=> X=28
\(x\cdot15+x+15=463\)
\(x\cdot15+x=463-15\)
\(x\cdot15+x=448\)
\(x\cdot\left(15+1\right)=448\)
\(x\cdot16=448\)
\(x=448:16\)
\(x=28\)
x . 15 + x + 15 = 463
x . 15 + x = 463 - 15
x . 15 + x = 448
x . ( 15 + 1 ) = 448
x . 16 = 448
x = 448 : 16
x = 28
x . 15 + x + 15 = 463
x . 15 + x = 463 - 15
x . 15 + x = 448
x . ( 15 + 1 ) = 448
x . 16 = 448
x = 448 : 16
x = 28
3990- (463 x 72 - 39 x 39 ) : 15 =
= 3990 - ( 463 x 72 - 39 x 39 ) : 15
= 3990 - ( 33336 - 1521 ) : 15
= 3390 - 31815 : 15
= 3390 - 2121
= 1269
a) 463+318+137+22
= (463+137)+(318+22)
= 600+340
= 940
b) 185.32-32.85
= 32.(185-85)
= 32 . 100
= 3200
c) \(15:\left\{390:\left[500-\left(125+35.7\right)\right]\right\}\)
\(\text{= }15:\left\{390:\left[500-\left(125+245\right)\right]\right\}\)
\(\text{= }15:\left\{390:\left[500-370\right]\right\}\)
\(=15:\left(390:130\right)\)
\(\text{= }15:3\)
\(\text{= }5\)
a)\(463+318+137+22\)
\(=\left(463+137\right)+\left(318+22\right)\)
\(=600+340=940\)
b)\(185.3^2-3^2.85\)
\(=3^2.\left(185-85\right)\)
\(=9.100=900\)
c)\(15:\left\{390:\left[500-\left(125+35.7\right)\right]\right\}\)
\(=15:\left\{390:\left[500-\left(125+245\right)\right]\right\}\)
\(=15:\left\{390:\left[500-370\right]\right\}\)
\(=15:\left\{390:130\right\}\)
\(=15:3=5\)
x.15+x+15=463
x.16+15=463
x.16=463-15
x.16=488
x=488:16
x=28
\(x\cdot15+x+15=463\)
\(x\cdot\left(15+1\right)+15=463\)
\(x\cdot16+15=463\)
\(x\cdot6=463-15\)
\(x\cdot6=448\)
\(x=448:6\)
\(x=\frac{448}{6}\)
\(x=\frac{224}{3}\)