bài 437 Tính nhanh 13. -3/11 . -22/66 . 121/15 17. 1/3 . 4/5 + 1/3 . 6/5 18. 6/7 . 8/13 +6/13 . 9/7 - 3/13 . 6/7 19. -1/4 . 152/11 + 68/4 . -1/11 20. 3/7 . 9/26 - 1/14 . 1/13 21. 15(1/5 - 7/15) 22. 34(2và1/17 - 3và5/34)
Giúp mình với ạ
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
12) 17 – 11 – 14 – (-39)
13) −127 - 18.( 5 - 6)
14) 100 + (+430) + 2145 + (-530)
15) (+12).13 + 13.(-22)
16) {[14 : (-2)] + 7} : 2012
17) 13 – 18 – (- 42) - 15
18) 369 – 4[(-5) + 4.(-8)]
19) (-12).(-13) +13.(-29)
20) 125 – 4[ 3 – 7.(-2) ]
21) (-14).9 – 13.(-9) chỉ em với
Bài 1)Mẫu: -(-5) + (-12)
=5+(-12)
= (-7)
1) -(-17) - |-5|
2) - |+12| + (-14)
3) -(+15) + |-7|
4) (-9) + -(-13)
5) - (-12) + 0
6) - (-15) + (-15)
7) -(-27) - (+27)
8) - (-13) - |-13|
9) - |-13| - |-17|
10) |-25| + |-17|
11) -18 + |-5|
12) |-20| - (-27)
13) - |-32| - (+15)
14) - (-25) - |-48|
Giúp mik đi bài này mik ngu lẳm
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
7+12+17+22+27+8+10+12+14+16+18+20
giúp mình với
1. -2/9 x 15/17 + -2/9 x 2/17
2. -5/3 x 6/5 + -7/9 x 3/10
3. 15/20 x 7/5 + -9/7 x -6/4
4.-25/13 x 5/19 + -25/13 x 14/19
5 -7/13 x 13/5 + -9/7 x 5/3
BÀI 1: Tính
1) -(-10)-(+14)
2) -(+15)-12
3) (-11)-(-13)
4) -(-13)-(-10)
5) -4-(+7)
BÀI 2: Tìm x biết:
1) x+(-5)= -(-7)
2) x-8= -(+10)
3) x-(-12)= 14
4) x-(+3)= -17
5) x+20= -(-23)
BÀI 3: Tính:
1) 17-(-19)-(+25)
2) -[-13]-[15]+(-20)
3) [-17]-(-16)-(+23)
4) -(-25)-[-14]+[-17]
Tính:
a) ( -14) + 5 + 17 + 14 b) 40 +13 + ( -25) + ( -13)
c) ( -5) + ( -146)+ ( -15) + 14 d) ( -2) + (-5) + 20 + (- 13)