Thực hiện tính:
(-23) + 13 + (-17) + 57
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a) 52 . 2 - 32 . 4 b) 58 . 75 + 58. 50 - 58 . 25
= 25 . 2 - 9 . 4 = 58 . ( 75 + 50 - 25 )
= 50 - 36 = 58 . 100
= 14 = 5800
A. -14 - 7 - 12 - 24
= - 21 - 12 - 24
= - 33 - 24
= - 57
B. -10 - 14 - 16 + 43
= - 24 - 16 + 43
= - 40 + 43
= - 83
C. 32 + |-23| - 57 - (-23)
= 32 + 23 - 57 +23
= 55 - 57 + 23
= - 2 + 23
= 21
D. |-8| + |-4| - (-12) + 5
= 8 + 4 + 12 + 5
= 12 + 12 + 5
= 24 + 5
= 29
E. |-13| - |-17| + (-20) - (-18)
= 13 - 17 - 20 + 18
= - 4 - 17 - 20 + 18
= - 21 - 20 + 18
= - 41 + 18
= 23
A. -14-7-12-24=-21-36=-57
B. -10-14-16+43=-24+27=3
C.32+\(^{|-23|}\)-57-(-23)=32+23-57+23=55-80=-25
D.\(|-8|+|-4|\)-(-12)+5=8+4+12+5=12+17=29
E.\(|-13|-|-17|\)+(-20)-(-18)=13-17-20+18=-4-2=-6
a: \(3^2+10:2=9+5=14\)
b: \(13\cdot\left(23+17\right)-17\cdot\left(23+13\right)\)
\(=13\cdot23+13\cdot17-17\cdot23-17\cdot13\)
\(=13\cdot23-17\cdot23\)
\(=-4\cdot23=-92\)
c: \(-8+2\left(x-4\right)=2^3\cdot3^2\)
=>\(2\left(x-4\right)-8=8\cdot9=72\)
=>2(x-4)=72+8=80
=>x-4=40
=>x=44
a) \(\left(-23\right)+13\left(-17\right)+57\)
\(=\left(-23\right)+\left(-221\right)+57\)
\(=-23-221+57\)
\(=-\left(23+221\right)+57\)
\(=-244+57\)
\(=-\left(244-57\right)\)
\(=-187\)
b) \(\left(-26\right)+\left(-6\right)+\left(-75\right)+\left(-50\right)\)
\(=-26-6-75-50\)
\(=-\left(26+6\right)-75-50\)
\(=-32-75-50\)
\(=-\left(32+75\right)-50\)
\(=-107-50\)
\(=-\left(107+50\right)\)
\(=-157\)
c) \(14+6+\left(-9\right)+\left(-14\right)\)
\(=14+6-9-14\)
\(=20-9-14\)
\(=11-14\)
\(=-3\)
d) \(\left(-123\right)+\left|13\right|+\left(-7\right)\)
\(=-123+13-7\)
\(=-\left(123-13\right)-7\)
\(=-110-7\)
\(=-\left(110+7\right)\)
\(=-117\)
e) \(\left|0\right|+\left|45\right|+\left(-\left|-455\right|\right)+\left|-796\right|\)
\(=0+45+\left(-455\right)-796\)
\(=45-455-796\)
\(=-410-796\)
\(=-\left(410+796\right)\)
\(=-1206\)
f) \(-\left|-33\right|+\left(-12\right)+18+\left|45-40\right|-57\)
\(=-33-12+18+\left|5\right|-57\)
\(=-\left(33+12\right)+18+5-57\)
\(=-45+18+5-57\)
\(=-\left(45-18\right)+5-57\)
\(=-27+5-57\)
\(=-\left(27-5\right)-57\)
\(=-22-57\)
\(=-\left(22+57\right)\)
\(=-79\)
a) 20.(-5)+23.(-30)
=-100+(-690)
=-790
b)(-57).33-67.(-23)
=-1881-(-1541)
=-340
a, (37-17). (-5) +23 . (-13-17)
=20. (-5) +23. (-30)
= -100-690
= -790
b,(-57) . (67-34)-67.(34-57)
=(-57).33-67 .(-23)
= -1881 + 1541
= -340
a, ( 37 - 17 ) . ( -5 ) + 23 . ( -13 - 17 ) b, ( -57 ) . ( 67 - 34 ) - 67 . (34 -57 )
= 20 . ( -5 ) + 23 . 4 =-57 . 69 + 57 . 34 - 67 . 34 + 67 . 57
= -100 + (-690 ) = 57 . 34 - 67 . 34
= -790 = 34 . ( 57 - 67 )
= 34 . ( -10 )
= -340
nho k cho minh nhieu nha
Cách 1:
a) (37 - 17).(-5) + 23.(-13-17)
= 20.(-5) + 23.(-30)
= (-100) + (-690)
= -790
b) (-57).(67 - 34) - 67.(34 - 57)
= (-57).33 - 67.(-23)
= 1881 - 1541
= 340
Cách 2:
a) (37 - 17).(-5) + 23.(-13 - 17)
= - 37.5 + 17.5 - 23.13 - 23.17
= (17.5 - 23.17) - (37.5 + 23.13)
= 17.(5 - 23) - (185 + 299)
= 17.(-18) - 484
= -306 - 484
= -790
b) (-57).(67 - 34) - 67.(34 - 57)
= -57.67 + 57.34 - 67.34 + 67.57
= (67.57 - 57.67) + (57.34 - 67.34)
= 34.(57 - 67)
= 34.(-10)
= -340
Tính:
a) (37 - 17) . (-5) +23 . ( -13 - 17)
=20.18.-30
=-10800
b) (-57) . (67-34) - 67 . (34 - 57)
=(-57).33-67.(-23)
=(-1881)-(-1541)
= -340
= [(- 23) + (- 17)] + (13 + 57)
= (-40) + 70
= 30
Hk tốt và nhớ tk nhe