Toán Lớp 6: Giúp e vs ạ, plssss
A) (-38).47+(-38).52+(-38)
B) 29.(-35)+(-29).64-(-29)
C) 52.(-18)+26.(-64)
D) 34.(-29)+17.38
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Toán Lớp 6: Giúp e vs ạ, plssss
A) (-38).47+(-38).52+(-38)
B) 29.(-35)+(-29).64-(-29)
C) 52.(-18)+26.(-64)
D) 34.(-29)+17.38
Comments ( 2 )
a)
( -38 ). 47 + ( -38 ). 52 + ( -38 )
= ( -38 ). ( 47 + 52 + 1 )
= ( -38 ). 100
= -3800
b)
29. ( -35 ) + ( -29 ). 64 – ( -29 )
= ( -29 ). 35 + ( -29 ). 64 – ( -29 )
= ( -29 ). ( 35 + 64 – 1 )
= ( -29 ). 98
= ( -29 ). ( 100 – 2 )
= ( -29 ). 100 – ( -29 ). 2
= -2900 – ( -58 )
= -3842
c)
52. ( -18 ) + 26. ( -64 )
= 26. 2. ( -18 ) + 26. ( -64 )
= 26. ( -36 ) + 26. ( -64 )
= 26. ( -36 – 64 )
= 26. ( -100 )
= -2600
d)
34. ( -29 ) + 17. 38
= 17. 2. ( -29 ) + 17. 38
= 17. ( -58 ) + 17. 38
= 17. ( -58 + 38 )
= 17. ( -20 )
= -340
Lời giải và giải thích chi tiết:
a)
(-38).47+(-38).52+(-38)
=-38.(47+52+1)
=-38.100
=-3800
b)
29.(-35)+(-29).(64)-(-29)
=-29.35-29.64-(-29)
=-29.(35+64-1)
=-29.98
=-2842
c)
52.(-18)+26.(-64)
=26.2.(-18)+26.(-64)
=26.(-2.18-64)
=26.(-36-64)
=26.(-100)
=-2600
d)
34.(-29)+17.38
=34.(-29)+17.2.19
=34.(-29)+34.19
=34.(-29+19)
=34.(-10)
=-340