Question

[vũ khánh ngọc]

1. thực hiện phép tính : 

a/ 27 . 332 + 93 . 43 + 57 . 61 + 69 . 57 

b/ 34 . 75 + 75 . 66 - 65 . 100

c/ ( 456 . 11 + 912 ) . 37 : 13 : 74

d/ 6² : 4 . 3  + 2 . 5² 

e /  5 . 4² - 18 : 3² 

g/ [ ( 315 + 372 ) . 3 + ( 372 + 315 ) . 7 ] : ( 26 . 13 + 74 .14 ) 

h/ 12 : { 390 : [ 500 - ( 125 + 35 . 7 ) ] } 

k / 192000 - ( 1500 . 2 + 1800 . 3 + 1800 .2 : 3 )

Answer 1

[Phạm Quang Lộc]

\(27.332+93.43+57.61+69.57\\ =27.332+93.43+57.\left(61+69\right)\\ =27.332+93.43+57.130\\ =8964+3999+7410=20373\\ 34.75+75.66-65.100\\ =\left(34+66\right).75-65.100\\ =100.75-65.100\\ =100.\left(75-65\right)\\ =100.10=1000\\ \left(456.11+912\right).37:13:74\\ =5928:13:\left(74:37\right)\\ =456:2=228\\ 6^2:4.3+2.5^2\\ =36:4.3+2.25\\ =9.3+50=27+50=77\\ 5.4^2-18:3^2\\ =5.16-18:9\\ =80-2=78\\\left[\left(315+372\right).3+\left(372+315\right).7\right]:\left(26.13+74.14\right)\\ =687.\left(3+7\right):\left(338+1036\right)\\ 687.10:1374\\ =6870:1374=5\\ 12:\left\{390:\left[500-\left(125+35.7\right)\right]\right\}\\ =12:\left[390:\left(500-370\right)\right]\\ =12:\left(390:130\right)=12:3=4\\ 192000-\left(1500.2+1800.3+1800.2:3\right)\\ =192000-\left(3000+5400+1200\right)\\ =192000-9600=182400\)