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a) 5 . 125 . 2 . 41 . 8
=(5.2).(125.8).41
= 10 . 1000 . 41
= 10000 . 41
= 410000
b) 25 . 7 . 10 . 4
=(25.4).(7.10)
= 100 . 70
= 7000
c) 8 . 12 . 125 . 2
= (8.125).(12.2)
= 1000 . 24
= 24
d) 4 . 36 . 25 . 50
=(4.25).(36.50)
= 100 . 180
= 18000
2.
a) 37 . 7 + 80 . 3 + 43 . 7
= 7. (37 + 43) + 80 . 3
= 7 . 80 + 240
= 560 + 240
= 800
1)
\(45\left(13+78\right)+9\left(87+22\right)5\)
\(=45\left(13+78\right)+45\left(87+22\right)\)
\(=45\left(13+78+87+22\right)\)
\(=45\left[\left(87+13\right)+\left(78+22\right)\right]\)
\(=45\left[100+100\right]\)
\(=45.200\)
\(=9000\)
2)
\(43+37+93.43+57.61+69.57\)
\(=43\left(37+93\right)+57.\left(61+69\right)\)
\(=43.130+57.130\)
\(=130\left(43+57\right)\)
\(=130.100\)
=13000
\(27.332+93.43+57.61+69.57\\ =27.332+93.43+57.\left(61+69\right)\\ =27.332+93.43+57.130\\ =8964+3999+7410=20373\\ 34.75+75.66-65.100\\ =\left(34+66\right).75-65.100\\ =100.75-65.100\\ =100.\left(75-65\right)\\ =100.10=1000\\ \left(456.11+912\right).37:13:74\\ =5928:13:\left(74:37\right)\\ =456:2=228\\ 6^2:4.3+2.5^2\\ =36:4.3+2.25\\ =9.3+50=27+50=77\\ 5.4^2-18:3^2\\ =5.16-18:9\\ =80-2=78\\\left[\left(315+372\right).3+\left(372+315\right).7\right]:\left(26.13+74.14\right)\\ =687.\left(3+7\right):\left(338+1036\right)\\ 687.10:1374\\ =6870:1374=5\\ 12:\left\{390:\left[500-\left(125+35.7\right)\right]\right\}\\ =12:\left[390:\left(500-370\right)\right]\\ =12:\left(390:130\right)=12:3=4\\ 192000-\left(1500.2+1800.3+1800.2:3\right)\\ =192000-\left(3000+5400+1200\right)\\ =192000-9600=182400\)
113x48+87x62+62x113+38x87
=113x(48+62)+87x(62+38)
=113x110+87x100
=12430+8700
=21130
1300
ai bấm sai thì cứ bấm
nhưng mình đúng thì vẫn là thật
\(a)9.4.25.8.125\)
\(=9.\left(4.25\right).\left(8.125\right)\)
\(=9.100.1000\)
\(=900.1000\)
\(=900000\)
\(a,9.4.25.8.125=9.\left(4.25\right).\left(8.125\right)=9.100.1000=900000\)
\(b,25.5.27.2\)(câu này hình như thiếu đề, ko tính nhanh đc)
\(c,37.7+80.3+43.7\)\(=7.\left(37+43\right)+80.3\)\(=7.80+3.80=80\left(7+3\right)=80.10=800\)
\(d,113.38+113.62+87.62+87.38\)\(=113\left(38+62\right)+87\left(62+38\right)\)
\(=113.100+87.100=100.\left(113+87\right)=100.200=20000\)
Viết gọn lũy thừa:
\(a,x.x.y.y.x.y.x=\left(x.x.x.x\right).\left(y.y.y\right)=x^4.y^4\)
\(b,7^5:343=7^5:7^3=7^{5-3}=7^2\)
\(c,A^{12}:A^{18}=A^{12-18}=A^{-6}\)
\(d,x^7.x^4.x=x^{7+4+1}=x^{12}\)
=43.37+93.43+57.61+69.57
=43.(37+93)+57.(61+69)
=43.130+77.130
=130.(43+57)
=13000
2 . 53 . 27 + 6 . 9 . 87 - 3 . 18 . 40
= 2. 53 . 9 . 3 + 2. 3 .9 .87 - 3 .2 .9 .40
= 54.53+54.87-54.40
=54(53+87-40)
=54. 100=5400
12 . 25 + 29 . 25 + 59 . 25
= 25 . ( 12+29+59)
=25 . 90
=2250
43 . 37 + 93 . 43 + 57 . 61 + 69 . 57
= 43.(37+93)+57(61+69)
=43.130+57.130
=130.(43+57)
=130.100
=13 000
12 . 53 + 53 . 172 - 53
=53(12+172-1)
=53.184
=9752
35 . 54 + 35 . 58 + 65 . 75 + 65 . 45
=35(54+58)+65(75+45)
=35.112+65.120
=3920+7800
=11720
39 . 8 + 70 . 3 + 31 . 8
=8(39+31)+70.3
=8.70+70.3
=70.(8+3)
=70.11
=770
a) 113.38+87.62+113.62+87.38
=(113.38+87.38)+(87.62+113.62)
=38.(113+87)+62.(87+113)
=38.200+62.200
=200.(38+62)
=200.100
=20000
b) 2.125.18+3.12.252+4.223.9
= 2.18.125+3.12.252+4.9.223
=36.125+36.252+36.223
=36.(125+252+223)
=36.500
=18000
Chúc bạn học tốt~~~
a,12345679x45=12345679x9x5=111111111x5=555555555
b,43 x 37+93 x 43+57 x 61+69 x 57
=43x(37+93)+57(61+69)
=43 x 130+57 x 130
=130 x(43+57)
=130 x 100
=13000
e) 113 x 38 + 113 x 62 + 87 x 62 + 38
= 38 x (113+1)+62 x (113+87)
= 38 x 114 + 62 x 220
= 4332 + 13640
= 17972
g) 37 x 43 + 93 × 43 + 57× 61+ 69 × 57
= 43 x (37 + 93 ) + 57 x ( 61+69)
= 43 x 130 + 57 x 130
= 130 x (43+57)
= 130 x 100
= 13000