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1)
\(24.125+52.25\)
\(=100.30+100.13\)
\(=100.\left(30+13\right)\)
\(=100.43\)
\(=4300\)
2)
Số số hạng : \(\left(283-7\right):4+1=70\)
\(\Rightarrow A=\frac{\left(283+7\right).70}{2}=10150\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 125 x 25 x 64
= ( 25 x 64 ) x 125
= 1600 x 125
= 200 000
b) 125 x 25 x 12 x 14
= ( 125 x 12 ) x ( 25 x 14 )
= 1500 x 350
= 525000
c) 1300 : 50 = 26
d) 700 : 25 = 28
a, = 125 x (25x64)=125 x 1600= 200 000
b, = (125 x 24) x ( 25 x 12) = 3000 x 300 = 900 000
c, 1300 : 50 = 26
d, 700 : 25 = 28.
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15*6*4*125*8=360000
14*25*6*7=14700
24*3*5*10=3600
18*26*25*9=105300
12*5*15*7=6300
15 x 6 x 4 x 125 x 8
= (15 x 4) x (125 x 8) x 6
= 60 x 1000 x 6
= 60000 x 6
= 360000
14 x 25 x 6 x 7
= (14 x 25) x 6 x 7
= 350 x 6 x 7
= 2100 x 7
= 14700
24 x 3 x 5 x 10
= (24 x 5) x 10 x 3
= 120 x 10 x 3
= 1200 x 3
= 3600
18 x 26 x 25 x 9
= (26 x 25) x 18 x 9
= 650 x 18 x 9
= 11700 x 9
= 105300
12 x 5 x 15 x 7
= (12 x 15) x 5 x 7
= 180 x 5 x 7
= 900 x 7
= 6300
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Bài làm
a) 15 x 18
= 15 x 2 x 9
= 30 x 9
= 27
b) 25 × 24
= 25 x 4 x 6
= 100 x 6
= 600
c) 125 × 72
= 125 x 8 x 9
= 1000 x 9
= 9000
d) 55 × 14
= 5 x 11 x 2 x 7
= ( 5 x 2 ) x ( 11 x 7 )
= 10 x 77
= 770
# Học tốt #
15 x 18 = 270
25 x 24 = 600
125 x 72 = 9000
55 x 14 = 770
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(-4).8.25.(-125).7
=[(-4x.25]x[8.(-125)]
=-100 x -1000
=100000
Tính nhanh : 52 . (-67) - 52 . ( -43 ) + 24 . ( -48 )
-12.7 + (-8) . 7 + 4 . ( -25) + ( -6 ) . ( -25)
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính nhanh :
52 . (-67) - 52 . (-43) + 24 . (-48)
= 52 . [ (-67) - ( -43) ] + 24 . (-48)
= 52 . (-24) + 24 . (-48)
= (-52) . 24 + 24 . (-48)
= 24 . [ (-52) + (-48) ]
= 24 . (-100)
= - 2400
(-12) . 7 + (-8) . 7 + 4 . (-25) + (-6) . (-25)
= 7 . [ (-12) + (-8) ] + (-100 ) + (-6) . (-25)
= 7 . (-20) - 100 + (-6) . (-25)
= (-140) - 100 + 150
= (-240) + 150
= -90
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(48.19+48.15+134.52\)
\(=48\left(19+15\right)+6968\)
\(=48.34+6968\)
\(=1632+6968\)
\(=8600.\)
b) \(27.121-87.27+73.34\)
\(=27\left(121-87\right)+73.34\)
\(=27.34+73.34\)
\(=34\left(27+73\right)\)
\(=34.100\)
\(=3400.\)
c) \(125.98-125.46-52-25\)
\(=125\left(98-46\right)-52-25\)
\(=125.52-52-25\)
\(=52\left(125-1\right)-25\)
\(=52.124-25\)
\(=6448-25\)
\(=6423.\)
d) \(136.23+136.17-40.36\)
\(=136\left(23+17\right)-40.36\)
\(=136.40-40.36\)
\(=40\left(136-36\right)\)
\(=40.100\)
\(=4000.\)
e) \(66.25+5.66+66.14+33.94\)
\(=33\left(2.50+5.2+14.2+94\right)\)
\(=33\left(50+10+28+94\right)\)
\(=33.182\)
\(=6006.\)
24 x 125 + 52 x 25=4300
(24*125)+(52*25)=4300