234-125=?
Bài 4: Tính hợp lí:
a) 234 x 45 + 54 x 234 + 234 b) 50 x 8 x 125 x 20
a: =234x(45+54+1)
=234x100
=23400
b: =(8x125)x(50x20)
=1000x1000
=1000000
a = 243x(45+54+1)
=243 x 100
=24300
b = (20 x 50 ) x (8x125)
=1000x1000
=1000000
a) 234 x 45 + 54 x 234 + 234
= 234 x (45+54+1) = 234 x 100 = 23400
b) 50 x 8 x 125 x 20 = (50 x 20) x (8 x 125)
= 1000 x 1000 = 1000000
tìm cách tính thuận tiện nhất :
725 : 25 + 525 : 25
234 x 45 + 55 + 234 + 234
50 x 8 x 125 x 20
a: =1250:25=50
b: =234(45+55)+234=23400+234=23634
c: =1000x1000=1000000
Tính : ( 1 + 2 + ... + 100 ) x ( 1125 - 125 x 9 ) x ( 234 x 12 + 234 x 88 )
=(1+2+...+100)*(1125-1125)*(234*12+234*88)
=(1+2+...+100)*0*(234*12+234*88)
=0
125 phần trăm : x + 234 =7,75
(Giúp mình với)
125% : \(x\) + 234 = 7,75
125% : \(x\) = 7,75 - 234
125% : \(x\) = - 226,25
\(x\) = 125% : (- 226,25)
\(x\) = - \(\dfrac{1}{181}\)
125% : x + 234 = 7,75
\(\dfrac{5}{4}\) : x + 234 = 7,75
\(\dfrac{5}{4}\) : x = 7,75 - 234
\(\dfrac{5}{4}\) : x = -226,25
x = \(\dfrac{5}{4}\) : (-226,25)
x = \(\dfrac{1}{181}\)
tick cho mik
Tính nhanh
312 x 425 + 547 + 312
234 x 1257 - 234 x 257
175 x 1274 - 175 x 273 - 175
4 x 125 x 25 x 8
Lời giải:
1. Bạn coi lại đề
2. $=234\times (1257-257)=234\times 1000=234000$
3. $=175\times (1274-273-1)=175\times 1000=175000$
4. $=(4\times 25)\times (125\times 8)=100\times 1000=100000$
1. ...............................
2.
3.
4.
Tính nhanh:
a) 234-117+(-100)+(-234)
b) -927+1421+930+(-1421)
c)11-12+13-14+15-16+17-18+19-20
d) 101-102-(-103)-104-(-105)-106-(-107)-108-(-109)-110
e) (-125)+100+80+125+20
a) 234 - 117 + (-100) + (-234) = [234 + (-234)] - [117 + (-100)] = 0 + 17 = 17.
b) (-927) + 1421 + 930 + (-1421) = [(-927) + 927)] + (1421 + 930) = 0 + 2351 = 2351.
c) 11 - 12 + 13 - 14 + 15 - 16 + 17 -18 + 19 - 20 = (11 - 20) + (12 - 19) + (13 - 18) + (14 - 17) + (15 - 16)
= (-9) + (-7) + (-5) + (-3) + (-1) = -25.
d) 101 - 102 - (-103) - 104 - (-105) - 106 - (-107) - 108 - (-109) - 110
= (-101) + (-102) + 103 + (-104) + 105 + (-106) + 107 + (-108) + 109 + (-110)
= (-203) + (-205) + (-204) + (-203) + (-110)
= -925.
e) (-125) + 100 + 80 + 125 + 20 = [(-125) + 125] + 100 + (80 + 20) = 0 + 100 + 100 = 200.
Đặt tính rồi tính.
548 + 312 592 + 234 690 + 89 427 + 125
\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{548}\\{312}\end{array}}\\\hline{\,\,\,\,860}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{592}\\{234}\end{array}}\\\hline{\,\,\,826}\end{array}\)
\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{690}\\{\,\,\,89}\end{array}}\\\hline{\,\,\,779}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{427}\\{125}\end{array}}\\\hline{\,\,\,552}\end{array}\)
Đặt tính rồi tính:
a) 415 + 326 356 - 125
b) 234 + 732 652 - 126
Thực hiện phép tính
{245.8-125:(3.12-11)}:5+3.(234-2.19)
={245 x 8 - 125 : (36 - 11) } : 5 + 3. (234 - 38)
={1960-125 : 25} : 5 + 3.196
= 1960 - 5 : 5 + 588
= 1960 - 1 +588
= 1959 + 588
= 2547