Tính:
a. 14 000 : 20 =………………. b. 420 : 70 = …………………..
Bài 5: Thực hiện phép tính:
a) 47 – [(45.24 – 52.12):14] | a) 3.52 + 15.22 – 26:2 |
b) 50 – [(20 – 23) : 2 + 34] | b) (- 25) . (- 4 ) + (- 70) . 3 |
c) 102 – [60 : (56 : 54 – 3.5)] | c) 62 : (- 9) - 50.2 – 33.(- 3) |
d) 50 – [(50 – 23.5):2 + 3] | d) 32.(- 50) - 23.10 – 81: (- 3) |
e) 10 – [(82 – 48).5 + (23.10 + 8)] : 28 | e) 513 : 510 – 25.22 |
f) 8697 – [37 : 35 + 2(13 – 3)] | f) 20 : 22 + 59 : 58 |
g) 2011 + 5[300 – (17 – 7)2] | g) 100 : 52 + 7.32 |
h) 695 – [200 + (11 – 1)2] | h) 84 : 4 + 39 : 37 + 50 |
i) 129 – 5[29 – (6 – 1)2] | i) 29 – [16 + 3.(51 – 49)] |
j) 2010 – 2000 : [486 – 2(72 – 6)] | j) 53.2 – 100 : 4 + 23.5 |
f: =20:4+5
=5+5
=10
e: =125-100=25
Tìm x, biết
a) 575 – (6X + 70) = 445
b) (32.15) : 2 = (X +70) : 14 – 40
c) (X – 15) -75 = 0 d) 420 + 65.4 = (X + 175):5 +30
e) X – 4867 = (175.2050.70) : 25 + 23 f) [(X + 32) -17].2 = 42
g) 96 – 3.(X+1)=42 h) 165 – 19.(35 : X + 3) = 13
\(a,\Rightarrow6x+70=130\Rightarrow6x=60\Rightarrow x=10\\ b,\Rightarrow240=\left(x+70\right):14-40\\ \Rightarrow\left(x+70\right):14=280\\ \Rightarrow x+70=3920\Rightarrow x=3850\\ c,\Rightarrow x-15=75\Rightarrow x=90\\ d,\Rightarrow\left(x+175\right):5=680-30=650\\ \Rightarrow x+175=3250\Rightarrow x=3075\\ e,\Rightarrow x-4867=1004523\Rightarrow x=1009390\\ f,\Rightarrow x+32-17=24\Rightarrow x=9\\ g,\Rightarrow3\left(x+1\right)=54\Rightarrow x+1=18\Rightarrow x=17\\ h,\Rightarrow19\left(35:x+3\right)=152\\ \Rightarrow35:x+3=8\Rightarrow35:x=11\Rightarrow x=\dfrac{35}{11}\)
6. Tính:
A) 14% + 29% = .............
B) 57,1% 4 = ...............
C) 20% 5% = ..............
D) 4% 6% = ................
Số?
a) 6 825 = 6 000 + 800 + 20 + ?
b) 33 471 = 30 000 + 3 000 + ? + 70 + 1
c) 75 850 = 70 000 + 5 000 + 800 + ?
d) 86 209 = 80 000 + 6 000 + ? + 9
\(a,6825=6000+800+20+5\)
\(b,33471=30000+3000+400+70+1\)
\(c,75850=70000+5000+800+50\)
\(d,86209=80000+6000+200+9\)
a) 6 825 = 6 000 + 800 + 20 + 5
b) 33 471 = 30 000 + 3 000 + 400 + 70 + 1
c) 75 850 = 70 000 + 5 000 + 800 + 50
d) 86 209 = 80 000 + 6 000 + 200 + 9
tìm x
a. 420+65:4 = (x+175):5+30
b. (32.15) :2 = (x+70) : 14 - 40
c. x - 4867 = (175.2050.70):25+23
a, \(420+65:4=\left(x+175\right):5+30\)
\(\Rightarrow\left(x+175\right):5+30=420+16,25\)
\(\Rightarrow\left(x+175\right):5=420+16,25-30=406,25\)
\(\Rightarrow x+175=2031,25\)
\(\Rightarrow x=1856,25\)
b, \(\left(32.15\right):2=\left(x+70\right):14-40\)
\(\Rightarrow\left(x+70\right):14-40=480:2\)
\(\Rightarrow\left(x+70\right):14=240+40=280\)
\(\Rightarrow x+70=3920\Rightarrow x=3850\)
c, \(x-4867=\left(175.2050.70\right):25+23\)
\(\Rightarrow x=39462500:25+23+4867\)
\(\Rightarrow x=1578500+23+4867=1583390\)
Chúc bạn học tốt!!!
. a) Tìm số tự nhiên a, biết rằng 720 ⋮ a, 540 ⋮ a và 70 < a < 100.
b) Tìm số tự nhiên b, biết rằng 120 ⋮ b, 300 ⋮ b, 420 ⋮ b và b > 20.
x-4867=(175.2050.70):25+24
420+65.4=(x+175):5+30
(32.15):2=(x+70):14-40
x - 4867 = (175.2050.70):25 + 24
x - 4867 = 251125:25 + 24
x - 4867 = 1004500 +24
x = 1004500 + 24 + 4867
x = 1009391
Tìm x:
a) 420 + 65x4 = ( x + 175) : 5 + 30
b) ( 32 x 15) : 2 = ( x + 70):14 - 40
c) x - 4867 = ( 175 x 2050 x 70) : 25 + 23
Đề ko sai đâu!!Ai nhanh mình tick cho!!!
420 + 65x4 = ( x + 175) : 5 + 30
420 + 260 = x : 5 + 175 : 5 + 30
680 = x : 5 + 35 + 30
680 - 30 = x : 5 + 35
650 = x : 5 + 35
650 - 35 = x : 5
615 = x : 5
615 x 5 = x
3075 = x
b) ( 32 x 15) : 2 = ( x + 70):14 - 40
480 : 2 = x : 14 + 70 : 14 - 40
240 = x : 14 + 5 - 40
240 + 40 = x : 14 + 5
280 = x: 14 + 5
280 - 5 = x : 14
275 = x : 14
275 x 14 = x
3850 = x
c) x - 4867 = ( 175 x 2050 x 70) : 25 + 23
x - 4867 = 25 112 500 : 25 + 23
x - 4867 = 1004500 + 23
x - 4867 = 1004523
x = 1004523 + 4867
x = 1008390
Số?
a) 11 568 = 10 000 + 1 000 + ? + 60 + ?
b) 72 934 = 70 000 + 2 000 + ? + ? + ?
c) ? = 80 000 + 6 000 + 100 + 30 + 7
d) ? = 20 000 + 100 + 30
a) 11 568 = 10 000 + 1000 + 500 + 60 + 8
b) 72 934 = 70 000 + 2000 + 900 + 30 + 4
c) 86 137 = 80 000 + 6 000 + 100 + 30 + 7
d) 20 130 = 20 000 + 100 + 30