a) 2×24×25+3×41×16+6×2×8×17
b)15×360+15×2×27+1500
c)47×63+53×21+47×37+53
d)2×169×12-3×68×8-24
e)2×56×24-3×36×16+4×12×95-6×3×8×5
f)(36×15×169)÷(5×18×13)
h)(112+2×28-5×28)÷28
i)1448-(448+500)
Tính hợp lí
A.35 x 34 + 35 x 38 + 65 x 75 + 65 x 45
B. 12x 53 + 53 x 172 - 53 x 84
C. 35 x 28 + 36 x 82 + 64 x 69 + 64 x 41
D. A = 1+2+3+...+100
E. B =17+19+...+101+103
G. D= 3x (12+13+14+15) + 3x(8+7+6+5)
9/10 - 13/75 - 1/6
2/15 - 2/65 - 4/39
31/23 - (7/32 + 8/23)
(1/3+12/67+13/41) - (79/67 - 28/41)
38/45 - (8/45 - 17/51- 3/11)
Tính nhanh
a) 31/23 - (7/32 + 8/23)
b) 38/45 - (8/45 - 17/51 - 3/11)
c)(1/3 + 12/67 + 13/41) - ( 79/67 - 28/41)
d) 1/5 + -1/6 + 1/7 + -1/8 + 1/9 + 1/8 + -1/7 + 1/6 + -1/5
tinh hop li: a,57.(47-74)+47.(74-57). b, -36(16 -41)- 16 (41-36). c, 15.(-27+30) - 27.(30-15) - 30.(5-27). d, (135-35).(-37)+37.(42-58). e,-65-(87-17) - 87.117
2/15-2/65-4/39
32/13-(7/23+8/23)
(1/3+12/67+13/41) - (79/67 - 28/41)
38/45 - (8/45-17/51-3/11)
Ai giải giùm mik bài tóa này nha
1 Tính :
a)5+(-5)
b)71-52
c)28+(-82)
d)47+(-30)
e)(-41)+(-59)
f)75+(-10)
t)26-43
y)90-25
o)72+(-9)
p)(-3)+3
2 Tính nhanh :
a)(-150)-47+150-53
b)250+(-90)-250-10+100
c)71+92-28-(-29)+8-72
d)45+(-31)-45+(-31)
3 Tìm x biết :
a)x-5=-15
b)21+x=-79
c)x-15=-23+(-6) d)200-x=/-32/-41
Tính hợp lí: B=47/41.(12+12/9+12/37-12/53/3+1/3-3/37-3/53:4+4/17+4/19+4/2006/5+5/17+5/19+5/2006)
a) 21/47 + 9/45 +26/47 + 4/5
= (21/47 + 26/47) + (9/45 + 4/5)
=1+1 = 2
b) 15/12 + 5/13 - 3/12 - 18/13
= (15/12 - 3/12) + (18/13 - 5/13)
=1+1 = 2
c) 13/25 + 6/41 - 38/25 + 35/41 - 1/2
= (38/25 - 13/25) + (35/41 + 6/41) + 1/2
= 1+1 + 1/2 = 5/2
d) 27/23 + 5/21 - 4/23 + 6/21 + 1/2
= (27/23 - 4/23) + (6/21 - 5/21) + 1/2
= ..........................
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