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![](https://rs.olm.vn/images/avt/0.png?1311)
như này hả:
\(36\cdot28+36\cdot82+64\cdot96+64\cdot41\)
\(=36\cdot\left(28+82\right)+64\cdot\left(96+41\right)\)
\(=36\cdot110+64\cdot137\)
\(=3960+8768=12728\)
tiick mk nha.
#ngố
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, $-28\cdot41+100\cdot141+41\cdot(-72)$
$=41\cdot[(-28)+(-72)]+100\cdot141$
$=41\cdot(-100)+(-100)\cdot(-141)$
$=(-100)\cdot[41+(-141)]$
$=(-100)\cdot(-100)$
$=100\cdot100$
$=10000$
b, $35\cdot(65-6)-65\cdot(35+6)$
$=35\cdot65+35\cdot(-6)-65\cdot35-65\cdot6$
$=(35\cdot65-65\cdot35)+[35\cdot(-6)+65\cdot(-6)]$
$=0+(-6)\cdot(35+65)$
$=-6\cdot100$
$=-600$
c, $-48+48\cdot(-78)-21\cdot48$
$=-48\cdot1+(-48)\cdot78+(-48)\cdot21$
$=-48\cdot(1+78+21)$
$=-48\cdot(79+21)$
$=-48\cdot100$
$=-4800$
![](https://rs.olm.vn/images/avt/0.png?1311)
1: Ta có: \(\left(7x-3^2\right):5=8\)
\(\Leftrightarrow7x-9=40\)
hay x=7
![](https://rs.olm.vn/images/avt/0.png?1311)
53 . 35 + 43 . 7
= 53 . 5 . 7 + 43 . 7
= 54 . 7 + 43 . 7
= ( 54 + 43 ) . 7
= 689 . 7
= 4823
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{35}{41}.\frac{-25}{21}.\frac{-82}{15}=\frac{50}{9}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
87 . 23 + 13 . 93 + 70 . 87
= 87 . 23 + 70 . 87 + 13 . 93
= 87 . (23 + 70) + 13 . 93
= 87 . 93 + 13 . 93
= 93 . (87 + 13)
= 93 . 100
= 9300.
87*23+13*93+70*87
=87.23+70.87+13.93
=87.(23+70)+13.93
=87.93+13.93
=93.(87+13)
=93.100
=9300
35 x 23 + 35 x 41 + 64 x 6
= 35 x ( 23 + 41 ) + 64 x 6
= 35 x 64 + 64 x 6
= 64 x ( 35 + 6)
= 64 x 41
= 2624