a. 15 . 23 + 4 . 32 - 5 . 7
=15 . 8+4 . 9 - 5 . 7
= 120 + 36 - 35
= 120+1
= 121
b. 56 : 53 + 23 . 22
= 53 + 25
= 125+32
= 157
Bài 2:Thực hiện phép tính:
a) \(4^3\) . 125-125.60
b)-23+[82-(-15-17)
1. Tính
a, 1+7+8+15+23+...+160
b, 17+4+5+9+19+...+60+9
c, 78*3+78*24+78*17*22*72
d, 53*39+47*39+47-53*21-47*21
e, 2*53*12+4*6*87-3*8*40
g, 5*7*77-7*60+49*25-15*42
h, 1*2+2*3+3*4+...+2016*2017
2. Tính nhanh
a. -5 + 11 + (-15) + 21 + (-25) + 31 + ........... + (-95) + 101
b. 3 + (-12) + 13 + (-22) + 23 + (-32) + ................ + 93 + (-102)
Mình sẽ mở một cuộc thi Toán 6 bạn nào muốn tham gia thì giải bài dưới đây nếu đạt mình sẽ mở vòng 2 ^^
ĐỀ CƯƠNG ÔN TẬP TOÁN 6
Bài 1 : Thực hiện phép tính :
a. 17.85 + 15.17 - 120 b.5.72 - 24:23 c. 33. 22 - 27.19 d. -|-3| + ( - 23 ) e. -|-13| + |-25 | + | 12 |
f. 23 - ( 12 - 42 ) g. 80 - [ 130 - ( 12 - 4 )2 ] h. 24.5 [ 131 - ( 13 - 22 ]2 ] i. - ( -23 ) + | - 13 | - | - 42 |
k. ( 315.4 + 5.315 ) : 316 l. 1125 : 32 + 43.125 - 125 : 52 m. |-18 | : | -6 | - ( -12 ) + ( -20 )
BÀI LÀM
a.________________________________________b.________________________________c._________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
1 . Tính nhanh
a/ 15 . ( 27 + 18 + 6 ) + 15 . ( 23 + 12 )
b/ 14 . 35 . 5 + 10 . 25 .7 + 20 . 70
c/ 53 . ( 51 + 4 ) + 53 . ( 49 + 96 ) + 53
d/ 46 . ( 27 + 75 ) + 8 . ( 58 + 25 ) . 2
so sanh : a,2^25-2^14+2^23 va2^23 -2^22 + 2^21
b,15^31 và 33^29
15^2005+5 /15^2012-2 va 15^2012+5/15^2011-2
Tính
1, 14/7 + 5/9 + 4/9 - 2
2, 31/25 + ( 15/16 - 6/15 ) + 2/3
3, 23/28 - ( 23/28 - 1/3 ) + 2/3
4, 1/12 + 1/20 + 1/30 + 1/42 + 1/56 + 1/72 + 1/90
1,Tính
A, 14/7 + 5/9 + 4/9 - 2
B, 31/25 + ( 15/16 - 6/15 ) + 1/16
C, 23/28 - ( 23/28 - 1/3 ) +2/3
D, 1/12 + 1/20 + 1/30 + 1/42 + 1/56 + 1/72 + 1/90
1.Thực hiện phép tính:
-90+23.(-7)-(+15).(-6)
\(\frac{-7}{11}+\frac{5}{-6}+\frac{37}{12}+\frac{-4}{11}\)
Biểu diễn các lũy thừa sao đây thành những lũy thùa cùng cơ số
(33)2 ; (23)5 ; 8110 ; (32)3
b, (53) ; (54)3 ; (52)4