Toán Lớp 6: Bài 2 Thực hiện phép tính :
a/ 27 . 85 + 15 . 27
b/ 67 : 64 – 25 . 2 + 20200
c/ 50.{272 : [12 – 4 + 2.(16 – 8)2]}
Bài 3 Tìm x N biết :
a/ 60. (x – 16) = 360
b/ 514 – 4.(1 + x) = 390
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Toán Lớp 6: Bài 2 Thực hiện phép tính :
a/ 27 . 85 + 15 . 27
b/ 67 : 64 – 25 . 2 + 20200
c/ 50.{272 : [12 – 4 + 2.(16 – 8)2]}
Bài 3 Tìm x N biết :
a/ 60. (x – 16) = 360
b/ 514 – 4.(1 + x) = 390
Comments ( 2 )
=27.(85+15)
=27.100=2700
b)=67 -50+20200 =67 +20250=67 +1296000 =1296067
64 64 64 64 64
=50.(272:40)
=50. 68=340
10
bài 3:a)60.(x-16)=360
x-16=360:60
x-16=6
x=6+16=22
b)514-4.(1+x)=390
4.(1+x)=514-390
4.(1+x)= 124
1+x=124:4
1+x=31
x=31-1=30