\(=10-\left[\left(91-48\right).5+\left(8.10+8\right)\right]:28\)
\(=10-\left[43.5+88\right]:28\)
\(=10-\left[215+88\right]:28\)
\(=10-303:28\)
\(=10-10,821\)
\(=0,179\)
Ko chắc
\(a.\left(5+2\right).x=36-1\)
\(7.x=35\)
\(x=5\)
\(b.\left(5+1\right).x=75+3\)
\(6.x=78\)
\(x=13\)
\(c.\left(6+1\right).x=5^2+3\)
\(7.x=25+3\)
\(7.x=28\)
\(x=4\)
\(d.\left(7-1\right).x=5^2+3.4-1\)
\(6.x=25+12-1\)
\(6.x=36\)
\(x=6\)
Bài 2 :
a) 5x + 2x = 62 - 50
<=> 7x = 35
<=> x = 5
b) 5x + x = 150 : 2 + 3
<=> 6x = 75 + 3
<=> 6x = 78
<=>x=13
c) 6x + x = 511 : 59 +31
<=> 7x = 52 + 3
<=> 7x = 28
<=> x = 4
d) 7x - x = 521 : 519 + 3 . 22 - 70
<=> 6x = 52 + 12 - 1
<=> 6x = 36
<=> x = 6
