a, tìm x
2x:22= 3.23+23
b, thuc hiện phép tính bằng cách hợp lý
65.59+65.42-13.5
45-[(18-15)2+24]
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(=45-\left(3^2+2^4\right)=45-\left(9+16\right)=45-25=20\)
b)\(=50+\left(30-2\left(14-3\right)\right)=50+\left(30-22\right)=50+8=58\)
a) (-124) + 24 = -100
b) 37. 78 + 37. 22
= 37 . ( 78 + 22 )
= 37 . 100
= 3700
Câu 1:
A={1;3;5;7;9}
Câu 2:
A. 24 x 82 + 24 x 18 - 100
= 24 x (82 + 18) - 100
= 24 x 100 - 100
= 2400 - 100 = 2300
B.12 + 3 [ 39 - (5 - 2 )2 ]
= 12 + 3. [39 - 32 ]
= 12 + 3 . [39-9]
= 12 + 3.30
= 12 + 90 = 102
\(65.59+65.42-13.5\)
\(\Rightarrow65.59+65.42-65\)
\(\Rightarrow65\left(59+42-1\right)=65.100=6500\)
65 . 59 + 65 . 42 - 13 . 5
= 65 . 59 + 65 . 42 - 65
= 65 . 59 + 65 . 42 - 65 . 1
= 65 . (59 + 42 - 1)
= 65 . 100
= 6500
#Học tốt!!!
~NTTH~
1. Q=165+247+528+125+315
= 100+60+5+200+40+7+500+20+8+100+20+5+300+10+5
= ( 100+200+500+100+300) + ( 60+40+20+20+10 ) +( 5+7+8+5+5 )
= 1200+150+30
=1280
R=1234+5678+8+80
=1000+200+30+4+5000+600+70+8+8+80
= ( 1000+5000) + ( 200+600 ) + (30+70+80) + ( 4+8+8)
=6000+800+180+20
=7000
Bài 1
Tính : Q=165+247+528+125+315
=(165+125)+(247+315+528)
=290+1090
= 1380
R=1234+5678+8+80
=(1234+6)+(5678+2)+80
= 1240+5680+80
= (1240+60)+(5680+20)
=1300+5700=7000
Bài 2:
A= 243-97=(243+7)-(97-7)=250-90=160
B= 400-42-58=400-(42+58)=400-100=300
C=600-67-33=600-(67+33)=600-100=500
D=200-24-46=200-(24+46)=200-70=130
E=400-5-6-7-8=400-(5+6+7+8)=400-26=374
F= 764-115-268-43-32-20-85-37
=764-(115+85)-(268+32)-(43+37)-20
=764-200-300-80-20
=164
G=350-7-18-52-48-72
=350-(18+72)-(52+48)-7
=350-90-100-7
=160-7
=153
a) 2x : 22 = 3.23 + 23
2x-2 = 23.(3+1) = 23.4=23.22 = 25
=> x -2 = 5
x = 7
b) 65.59+65.42 - 13.5
= 65.(59+42) - 13.5
= 65.101 - 13.5
= 65.101- 65
= 65.(101-1) = 65.100 = 6500
45-[(18-15)2 + 24 ]
= 45 - (32 + 24) = 45 - 25 = 20