Tính: (37 - 17).(-5) + 23.(-13 - 17)
Bài 1: Tính hợp lý
1) - 5 x ( 37 - 17 ) + 23 x ( - 13 - 17 )
2) - 37 x ( 55 - 23 ) + 55 x ( 23 - 37 )
tính :
(37-17).(-5)+23.(-13-17)
( 37 - 17 ) . ( - 5 ) + 23 . ( - 13 - 17 )
= 20 . ( - 5 ) + 23 . ( - 30 )
= ( - 100 ) + ( - 690 )
= ( - 790 )
(37-17) . ( -5)+23 . (- 13 - 17 ) = ?
tính giúp mình với nha
(37-17)*(-5)+23*(-13-17)=20*(-5)+23*(-30)=-100+(-690)=-790
(37-17) . ( -5)+23 . (- 13 - 17 )
=20 . (-5) +23 . (-13 -17 )
= - 100 + 23 . (-13 - 17 )
= - 100 + 23 . ( -30 )
= - 100 + ( - 690 )
= - 790
(37_17).(_5)+23.(_13_17) =20.(_5)+23.(_13_17) =_100+23.(_13_17) =100+(_690) =_790
Tính:
a) (37-17).(-5)+23.(-13-17)
b)(-57).(67-34)-67.(34-57)
a) 20.(-5)+23.(-30)
=-100+(-690)
=-790
b)(-57).33-67.(-23)
=-1881-(-1541)
=-340
tính :
a, ( 37 - 17 ) . ( -5 ) + 23 . ( -13-17 )
b, (-57).( 67 - 34 ) - 67 . ( 34 - 57 )
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
Tính:
a) (37 - 17) . (-5) +23 . ( -13 - 17)
b) (-57) . (67-34) - 67 . (34 - 57)
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
a) (37 - 17) . (-5) +23 . ( -13 - 17)
= 20 . (-5) +23 . 4
= 100 + 92
= 192
b) (-57) . (67-34) - 67 . (34 - 57)
= (-57) . 33 -67 . (-23)
= -1881 - (-1541)
= -1881 + 1541
= -340
(37-17).(-5)+23.(-13-17)=
(37-17) . (-5) + 23 . (-13 - 17)
\(\left(37-17\right)\cdot\left(-5\right)+23\cdot\left(-13-17\right)\)
\(=20\cdot\left(-5\right)+23\cdot\left(-30\right)\)
\(=-100+-690=-790\)
tính
a,(37-17).(-5)+23.(-13-17)
b,(-57).(67-34)-67.(34-57)