Đáp án:
Giải thích các bước giải:
`a, 900 + ( 120 : 1 + 0 : 250 )`
= `900 + ( 120 + 0 )`
= `900 + 120`
= `1020`
_________________
`b, 17119 : ( 119 - 714 : 7 ) + 3302 : 13 - 567`
= `17119 : ( 119 - 102 ) + 254 - 567`
= `17119 : 17 - 313`
= `1007 - 313`
= `694`
________________
`c, 9^4 - 8 . 9^3`
= `9^3 . ( 9 - 8 )`
= `729 . 1`
= `729`
________________
`d, 2^6 : 2^4 + 3^2 - 2^3`
= `2^2 + 9 - 8`
= `4 + 9 - 8`
= `13 - 8`
= `5`
Bài 3:
`a, 12x + 3x - 5x = 250`
`x . ( 12 + 3 - 5 ) = 250`
`x . 10 = 250`
`x = 250 : 10`
`x = 25`
________________
`b, ( 2x + 8 ) : 4 = ( x + 1 )`
`( 2x + 8 ) = ( x + 1 ) . 4`
`2x + 8 = 4x + 4`
`8 - 4 = 4x - 2x`
`4 = x . ( 4 - 2 )`
`x = 4 : 2`
`x = 2`
