đáp án:
xin hay nhất nhé !
@MinhTinh giúp bạn !
Giải thích các bước giải:
11) (-12) . 46 - 12 . 54
= -552 - 648
= -1200
12) 3784 + 23 - 2784 - 15
= ( 3784 - 3784 ) + ( 23 - 15 )
= 0 + 8
= 8
13) (-8) . 25 . (-2) . 4 . (-5) . 125
= [ -8 . 125 ] . [ 25. 4 ] . [ (-2) . (-5) ]
= -1000 . 100 .10
= -1000000
14) 19 . 25 + 9 . 95 + 19 . 30
= 475 + 855 + 570
= 1330 + 570
= 1900
15) ( -50 + 19 + 143 ) - ( -79 + 25 + 48 )
= ( -31 + 143 ) - ( -79 + 73 )
= 112 - (-6)
= 118
17) ( -37 - 17 ) . (-9) + 35 . (-9 - 11 )
= -54 . (-9) + 35 . (-20)
= 486 + -700
= -214
19) 512 . ( 2 - 128 ) - 128 . (-512)
= 512 . 2 - 512 . 128 - 128 . (-512)
= 1024 - 128 . ( 512 + -512 )
= 1024 - 128 . 0
= 1024 - 0
= 1024
16) (-25) ( 75 - 45 ) - 75 . ( 45 - 25 )
= (-25) . 30 - 75 . 20
= -750 - 1500
= -2250
18) ( 187 - 23 ) - ( 20 - 180 )
= 187 - 23 - 20 + 180
= 187 - 23 + 180 - 20
= 164 + 160
= 324
20) 17 . (-25) + 25 . 21
= -17 . 25 + 25 . 21
= 25 . ( -17 + 21 )
= 25 . 4
= 100
22) 16 . ( 38 - 2 ) - 38 . ( 16 - 1 )
= 16 . 38 - 16 . 2 - 38 . 16 + 38 . 1
= 16 . ( 38 - 38 ) + 38 - 32
= 16 . 0 + 2
= 0 + 2
= 2
24) 26 . (-125)- 125. (-36)
= -26 . 125 - 125 . (-36)
= 125 . [ -26 - (-36) ]
= 125 . 10
= 1250
26) 125 . (-24) + 24 . 225
= -125 . 24 + 24 . 225
= 24 . [ -125 + 225
= 24 . 100
= 2400
28) 42 + (-19) + 58 - (-19)
= ( 42 + 58 ) + [ -19 + 19 ]
= 100 + 0
= 100
30) 2³ . 5 - 3² . 4 + 4 . 6
= 8 . 5 - 9 . 4 + 4.6
= 40 - 36 + 24
= 4 + 24
= 28
21) 160 : { /-17/ + [ 3² . 5 - ( 14 + $2^{11}$ : $2^8$ ) ] }
= 160 : { 17 + [ 9 . 5 - ( 14 + $2^{11-8}$ ) ] }
= 160 : { 17 + [ 45 - ( 14 + 2³ ) ] }
= 160 : { 17 + [ 45 - ( 14 + 8 )]}
= 160 : { 17 + [ 45 - 22 ]
= 160 : [ 17 + 23 ]
= 160 : 40
= 4
23)/-6/ + (-7) + /-4/ + (-3)
= ( 6 + 4 ) + [ -7 + (-3) ]
= 10 + (-10)
= 0
