a) (-38) + 46+ (-62) + (-56)
b) (-17) + (-5).9
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54 x 2 x 9 x 5
= 54 x 9 x 2 x 5
= 486 x 10
= 4860
246 x 62 + 246 x 38
= 246 x ( 62 + 38 )
= 246 x 100
= 24600
428 x 56 - 428 x 46
= 428 x ( 56 - 46 )
= 428 x 10
= 4280
54 x 2 x 9 x 5
= 108 x 45
= 4860
246 x 62 + 246 x 38
= 246 x ( 62 + 38 )
= 246 x 100
= 24600
428 x 56 - 428 x 46
= 428 x ( 56 - 46 )
= 428 x 10
= 4280
Chúc bạn học tốt nha !
a, \(\dfrac{62}{7}.x=\dfrac{29}{90}.\dfrac{3}{56}\)
\(\dfrac{62}{7}.x=\dfrac{29}{1680}\)
\(x=\dfrac{29}{1680}:\dfrac{62}{7}\)
\(x=\dfrac{29}{14880}\)
b, \(\dfrac{1}{5}:x=\dfrac{1}{5}-\dfrac{1}{7}\)
\(\dfrac{1}{5}:x=\dfrac{2}{35}\)
\(x=\dfrac{1}{5}:\dfrac{2}{35}\)
\(x=\dfrac{7}{2}\)
c, \(\left(x+\dfrac{1}{4}-\dfrac{1}{3}\right):\left(2+\dfrac{1}{6}-\dfrac{1}{4}\right)=\dfrac{7}{46}\)
\(\left(x+\dfrac{1}{4}-\dfrac{1}{3}\right):\left(\dfrac{13}{6}-\dfrac{1}{4}\right)=\dfrac{7}{46}\)
\(\left(x+\dfrac{1}{4}-\dfrac{1}{3}\right):\dfrac{23}{12}=\dfrac{7}{46}\)
\(\left(x+\dfrac{-1}{12}\right):\dfrac{23}{12}=\dfrac{7}{46}\)
\(\left(x+\dfrac{-1}{12}\right)=\dfrac{7}{46}.\dfrac{23}{12}\)
\(x+\dfrac{-1}{12}=\dfrac{7}{24}\)
\(x=\dfrac{7}{24}-\dfrac{-1}{12}\)
\(x=\dfrac{3}{8}\)
a) 38 . (72 + 48) . 62 . (74 + 46)
=38 . 120 . 62 . 120
= 120 . (62 + 38)
= 120 . 100
= 12 000
b) 92 . (278 - 68) : (70 . 92)
=92 . 210 : 70 . 92
= \(\frac{92.210}{70.92}\)
=\(\frac{210}{70}\)= 3
kích mình nhé
1.
a) (-41) + (+15) = (-41) + 15 = - (41 - 15) = (-26)
b) 12 + (-56) = - (56 - 12) = (-44)
2.
a) 173 + (-46) + (-54) + 27 + (-19)
= (173 + 27) + [(-46) + (-54)] + (-19)
= 200 + (-100) + (-19)
= 100 + (-19) = 81
b) (-62) + 1523 + (-38) + (-2523) + (-92)
= [(-62) + (-38)] + [1523 + (-2523)] + (-92)
= (-100) + (-1000)+ (-92)
= (-1192)
a)(-38) + 46 + ( -62) + (-56)
= - ( 38 + 62 + 56 ) + 46
= - 156+46
= -110
b) (-17) + (-5).9
= (-17) + (-45)
= - ( 17 + 45 )
= -62
Học tốt
#Dương