Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
c: =53*55+53*145+53
=53*201
=10653
d: Số số hạng là (126-3):3+1=42(số)
Tổng là (126+3)*42/2=2709
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 13 . 58 . 4 + 32 . 26 . 2 + 52 . 10 b) 53 . 51 + 4 + 53 . 49 + 91 + 53
= 52 . 58 + 32 . 52 + 52 . 10 = 53 . 55 + 53 . 145 + 53 . 1
= 52. ( 58 + 32 + 10 ) = 53 . ( 55 + 145 + 1 )
= 52 . 100 = 53 . 201
= 52000 = 10653
~ Chúc bn hok tốt ~
![](https://rs.olm.vn/images/avt/0.png?1311)
7)
53.(51+4)+53.(49+96)+53
=53.55+53.145+53
=53.(55+145+1)
=53.201
=10653
8)
42.(15+96)+6.(25+4).7
=42.111+(6.7).29
=42.111+42.29
=42.(111+29)
=42.140
=5880
9)
45.(13+78)+9.(87+22).5
=45.91+(9.5).109
=45.91+45.109
=45.(91+109)
=45.200
=9000
10)
16.(27+75)+8.(53+25).2
=16.102+(8.2).78
=16.102+16.78
=16.(102+78)
=16.180
=2880
7)
53.(51+4)+53.(49+96)+53
=53.55+53.145+53
=53.(55+145+1)
=53.201
=10653
8)
42.(15+96)+6.(25+4).7
=42.111+(6.7).29
=42.111+42.29
=42.(111+29)
=42.140
=5880
9)
45.(13+78)+9.(87+22).5
=45.91+(9.5).109
=45.91+45.109
=45.(91+109)
=45.200
=9000
10)
16.(27+75)+8.(53+25).2
=16.102+(8.2).78
=16.102+16.78
=16.(102+78)
=16.180
=2880
![](https://rs.olm.vn/images/avt/0.png?1311)
5) 24*(15+49)+12*(50+42)
=24*64+12*92
=24*64+12*2*46
=24*64+24*46
=24*(64+46)
=24*110
=2640
`158 + 445 + 342 + 555`
`= (158 + 342) + ( 445 + 555)`
`= 500 + 1000`
` = 1500`
_________________________
`53 . ( 51 + 4) + 53 . ( 49 + 96) + 53`
`= 53 . 51 + 4 + 53 . 49 + 96 + 53`
`= 53 . ( 51 + 49) + 53 . ( 4 +96) + 53`
`= 53 . 100+ 53.100 + 53`
`= 53. 100+ 53.100 + 53 . 1`
`= 53 . ( 100 + 100 + 1)`
`= 53 . 201`
`= 10653`
a. \(158+445+342+555\\ =\left(158+342\right)+\left(445+555\right)\\ =1500\)
b. \(53.\left(51+4\right)+53.\left(49+96\right)+53\\ =53.\left(51+4+49+96\right)\\ =10600\)