1) 4.52-32:24
2) 9.8.14+6.(-17).(-12)+19.(-4).18
Tính nhanh:
a)\(9.8.14+6.\left(-17\right).\left(-12\right)+19.\left(-4\right).18\)
b)\(1-3+3^2-3^3+3^4-3^5+.....+3^{2014}-3^{2015}\)
các bn làm câu nào cx đc
n)8 . 9 . 14 + 6 . 17 . 12 + 19 . 4 . 18
Tính nhẩm
8*9*14+6*17*12+19*4*18 =???
Tính
a ) 9*8*14+6*(-12)* (-17)+19* (-4)*18
1) 2) 3) 4) 5) 6) 7) 8 ) 9) / 10) 4 11) 12)
13) 14) 15)
16) 17)
18) 19)
a 12 – 34 b 23 – 47 c 31 – 23 d 9 – 5 e 4 – 15 25 f 23 13 17 57 g 4 . 9 6 . 12 – 7 h 14 6 19 14 19 i 56 – 8. 27 7 j 8 5 . 2 – 3 6 k 4 . 3 125 . 25 8 l 9 6 . 3 – 4 7 m 45. 18 – 15 – 18. 45 – 15
1+2+3+4+5+6+7+8+9+10=
11+12+13+14+15+16+17+18+19+20=
1+2+3+4+5+6+7+8+9+10+11+12+13+14 +15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30-50-53=
bạn5 bạn nào làm nhanh mình sẽ tích cho bạn đó
a,-8/3+7/5+-71/15<x<-13/7+19/14+-7/2
b,-19/6+-15/2+11/3<x<-5/4+19/12+-10/3
c,-6/7+3/35<x<-2/5+3/7
d,x=3/4+1/-12
e,x/14=1/7+-3/14
f,11/18+13/6=85/x
g,8/17+5/17<x/17<6/17+9/17