Đáp án:
Giải thích các bước giải:
`( 3700 + 5300 ) - 5x = 1500`
`9000 - 5x = 1500`
`5x = 9000 - 1500`
`5x = 7500`
`x = 7500 : 5`
`x = 1500`
_ _ _ _ _
`x - 3 = 5^6 : 5^3 + 2^3 . 2^2`
`x - 3 = 5^3 + 2^5`
`x - 3 = 125 + 32`
`x - 3 = 157`
`x = 157 + 3`
`x = 160`
_ _ _ _ _
`[ 2 . ( 70 - x ) + 2^3 . 3^2 ] = 46`
`140 - 2x + 72 = 46`
`140 - 2x = 46 - 72`
`140 - 2x = -26`
`2x = 140 +26`
`2x = 166`
`x = 166 : 2`
`x = 83`
_ _ _ _ _
`x + ( x + 1 ) + ( x + 2 ) +..............+ ( x + 30 ) = 1240`
`x . [(30-0):1+1] + [(30-1):1+1] . (30+1) : 2 = 1240`
`x . 31 + 30 . 31 : 2 = 1240`
`x . 31 + 930 : 2 = 1240`
`x . 31 + 465 = 1240`
`x . 31 = 1240 - 465`
`x . 31 = 775`
`x = 775 : 31`
`x = 25`
