a , 43 . 125 - 125 . 60
= 125 . ( 43 - 60)
= 125 . ( 64 - 60)
= 125 . 4
= 500
b , -23 + [82 - (-15-17)]
= -23 + (82 +28)
=-23 + 110
= 87
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._________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Thực hiện phép tính sau :
a) 9 . 23 - 72 : 22
b) 125 . 26 + 53 . 32 + 25 . 42 . 5
c) 5871 : [ 928 - ( 247 - 82 ) . 5 ] + 20120
d) 2012 + 78 + ( -178 ) + ( -2012 )
Thực hiện phép tính
(-17) + 5 + 8 + 17 + (-3)
Tìm x:
35 - 3|x| = 5 . (23 - 4)
Thực hiện phép tính
a) 23 . 17 - 23 . 14
b) 80 - ( 4 . 5 - 3 . 23 )
c) 35 - { 12 - [ -14 + ( -2) }
d) 49 - ( -45) - 23
e) 13 - 18 - ( -42) - 15
g) -452 - ( -67 + 75 - 452 )
h) \(\left|31-17\right|-\left|13-52\right|\)
Bài 12 : Thực hiện phép tính một cách hợp lí:
p) \(\frac{-5}{9}+\frac{8}{15}+\frac{-2}{11}+\frac{4}{-9}+\frac{7}{15}\) q) \(\frac{5}{13}+\frac{-5}{17}+\frac{-20}{41}+\frac{8}{13}+\frac{-21}{41}\) r) \(\frac{1}{5}+\frac{-2}{9}+\frac{-7}{9}+\frac{4}{5}+\frac{16}{17}\)
Thực hiện các phép tinh:
a) [192 - ( 45 : 15)4 ]
b) [ (192 - 45 : 15) : 3)2 ]
Bài 15: Thực hiện phép tính:
a) 0,2 : \(1\frac{3}{5}+80\%\) b) 0,5 : \(\frac{5}{4}-2\frac{1}{5}\)
tính tổng: a) S1= 1+2+3+...+999 / b) s2=10+12+14+...+2010 / c0 s3= 21+23+25+...+1001 /d0s5=1+4+7+...+79 / e)=15+17+19+21+...+151+1533+155 / f) s7=15+25+35+...+115 / g) s4= 24+25+26+...+125+126
Thực hiện phép tính
a) \(-1\dfrac{2}{3}+\dfrac{3}{4}-\dfrac{1}{2}+2\dfrac{1}{6}\)
b) \(\dfrac{11}{50}\left(-17\dfrac{1}{2}\right)-\dfrac{11}{50}.82\dfrac{1}{2}\)