a) 137 x 7 + 137 x 93
= 137 x ( 93 + 7 )
= 137 x 100 = 13700
b) 428 x 102 - 428 x 2
= 428 x ( 102 - 2 )
= 428 x 100
= 42800
c) 124 x 25 - 25 x 24
= 25 x ( 124 - 24 )
= 25 x 100
= 2500
_HỌC TỐT_
a) 137 x 7 + 137 x 93
\(=137\times\left(7+93\right)\\ =137\times100\\ =13700\)
b) 428 x 102 - 428 x 2
\(=428\times\left(102-2\right)\\
=428\times100\\
=42800\)
c) 124 x 25 - 25 x 24
\(=25\times\left(124-24\right)=\\ 25\times100=2500\)
#Châu's ngốc
\(a,137.7+137.93\)
\(=137.\left(7+93\right)\)
\(=137.100=13700\)
\(b,428.102-428.2\)
\(=428.\left(102-2\right)\)
\(=428.100=42800\)
\(c,124.25-25.24\)
\(=25.\left(124-24\right)\)
\(=25.100=2500\)
137x7+137x93= 137x ( 7+ 93) =137 x 100
428x102-428x2= 428x (102-2 ) =428x 100=42800
124x25-25x24=25x( 124-24 ) = 25x100=2500
hok tốt
a) 137 . 7 + 137 . 93
= 137 . (7 + 93)
= 137 . 100
= 13700
b) 428 . 102 - 428 . 2
= 428 . (102 - 2)
= 402 . 100
= 40200
c) 124 . 25 - 25 . 24
= 25 . (124 - 24)
= 25 .100
= 2500
Lưu ý: dấu chám ở mỗi dòng đó là dấu nhân nha!
a , 137 x 7 + 137 x 93
= 137 x ( 7 + 93 )
= 137 x 100
= 13700
b , 428 x 102 - 428 x 2
= 428 x ( 102 - 2 )
= 428 x 100
= 42800
c , 124 x 25 - 25 x 24
= ( 124 - 24 ) x 25
= 100 x 25
= 2500
