7: =-1+8=7
6: \(=-\left(8\cdot125\right)\cdot\left(2\cdot5\right)\cdot\left(25\cdot4\right)=-1000000\)
5: =-50+19+143+79-25-48
=-75+98+95
=23+95
=118
4: =37x9+17x9-35x9-35x11
=18+153-385
=-214
tinh nhanh
3) (187 -23) – (20 – 180)
4) (-37 – 17). (-9) + 35. (-9 – 11)
5) (-50 +19 +143) – (-79 + 25 + 48)
6) (-8).25.(-2). 4. (-5).125
7) 3784 + 23 – 3785 – 15
Bài 2: Tính hợp lí
1) 125.(-24) + 24.225
2) 512.(2 – 128) – 128. (-512)
3) (187 -23) – (20 – 180)
4) (-37 – 17). (-9) + 35. (-9 – 11)
5) (-50 +19 +143) – (-79 + 25 + 48)
6) (-8).25.(-2). 4. (-5).125
7) 3784 + 23 – 3785 – 15
8) 215 +(-38) – (-58) –15
9) 5.(-3)2 –14.(-8)+(-40)
10) 215 + (-38) – (- 58) + 90 – 852)
Bài 3*: Tìm các cặp số nguyên (x;y) thỏa mãn xy2 + 2x – y2 =
(-50+19+143)-(-79+25+48)
(-25)(75-45)-75(45-25)
(-37-17).(-9)+35.(-9-11)
(187-23)-(20-180)
512.(2-128)-128.(-512)
17.(-25)+25.21
Giải rõ ra nha ! Mình cần gấp !
Bài 2: Tính nhanh (nếu có thể):
a) (187 -23) – (20 – 180)
b) (-50 +19 +143) – (-79 + 25 + 48)
c) 22. (-23) - 23. 78;
d) -83 . 36 + 17.(-36)
e) 2 - 4 + 6 - 8 + . .. + 1998 - 2000
f) 2 - 4 - 6 + 8 + 10 - 12 - 14 + 16 + .. .+ 1994 - 1996 -1998 + 2000
Cacban giải hộ mik với
tính hợp lý
a)5.(-3)^2-14.(-8)+(-40)
b)31-[26-(209+35)]
c)237+26-(209+26)
d)21+22+23+24-11-12-13-14
e)(-12).46-12.54
g)(-8).25.(-2).4.(-5).125
h)(-50+19+143)-(-79+25+48)
i)(-37-17).(-9)+35.(-9-11)
k)512.(2-128)-128.(-512)
l)160:{|-17|+[3^2.5-(14+2^11:2^8)]
m)|-6|+(-17)+|-4|+(-3)
n)5^6:5^3-5^0.5^1.5^2
o)100:{31-[24:(18-7.2)]}
k)
Dạng 2 : Tính hợp lí
1. 3.(-4)2 + 2.(-5) – 20 | 2. (- 54 ) + (+ 39) - ( +10) + ( - 85) |
3. 5.(-3)2 –14.(-8)+(-40) | 4. (- 24 ) + (- 30 ) - ( - 40) |
5. 31 – [26 – (209 + 35)] | 6. 29-(-25) + ( + 40) |
7. 231+26-(209+26) | 8. 215 + (-38) – (- 58) + 90 – 85 |
9. 21 + 22 + 23 + 24 – 11 – 12 – 13 – 14 | 10. 215 +(-38) – (-58) –15 |
11. (-12).46 – 12.54 | 12. 3784 + 23 – 3785 – 15 |
13. (-8).25.(-2). 4. (-5).125 | 14. 19.25 + 9.95 + 19.30 |
15. (-50 +19 +143) – (-79 + 25 + 48) | 16. (-25)(75 – 45) – 75(45 – 25) |
17. (-37 – 17). (-9) + 35. (-9 – 11) | 18. (187 -23) – (20 – 180) |
19. 512.(2 – 128) – 128.( - 512) | 20. 17.(-25) + 25.21 |
21. 160 : {|-17| + [32.5 – (14 + 211: 28)]} | 22. 16.(38 – 2) – 38(16 – 1) |
23. | -6 | + (-7) +| -4 | +(-3) | 24. 26.(- 125) – 125.( - 36) |
25. 56 : 53 – 50 . 51 . 52 | 26. 125.( -24) + 24.225 |
27. 21.135 + 21.65 – 200 | 28. 42+ (–19)+ 58 – (–19) |
29. 100 : {31 – [24 : (18 – 7.2)]} | 30. 23 . 5 – 32 . 4 + 4.6 |
Chỉ cần làm những câu chẵn thui nhaa!
4.24.5^2-(3^3.18+3^3.12)
31.15.7^2.4-31.49.40
1+2+3+4+5+6+7+8+9+10
1+3+5+7+9+11+13+15+19
2+6+10+14+22+23+26+34
5+8+11+14+17+20+23+26+29
1+6+11+16+21+26+31+36+41+47+51
10+13+16+19+22+25+28+31+34+37+40
5+7+9+11+13+15+17+3+8+13+18+23+28
4+7+10+13+16+19+5+9+13+17+21+25
Bài 6 : Tính hợp lí
1 . (-232)+55+(-63)+45
2 . (-205)+21+205+75
3 . 131+269+(-59)+(-131)
4 . (-196)+189+20+(-604)+(-199)
5 . (-170)+43+(-143)
6 . (-43)+(-17)+(-25)
7 . (-249)+121+I-29I+(-121)
8 . (-47)+(-139)+47+169
9 . (-13)+(-7)+(-75)
10 . (-9)+37+(-11)
11 . 12+(-23)+53
12 . (-3)+(-25)+23
13 . (-26)+10+(-14)
14 . (-13)+6+(-37)+14
15 . (-11)+(-9)+5+25
16 . (-12)+(-18)+8
17 . 315+[135+(-315)+(-35)]
18 . 815+[95+(-915)+(-45)]
19 . 5+(-7)+9+(-11)+13+(-15)
20 . (-10)+12+(-14)+16+(-18)+20
Tính nhanh:
a.(187-23)-(20-180)
b.(-50+19+143)-(-79+25+48)
GIÚP MK Vs
