12:100+13%
Tính:
a. 12 x 13 x 14
b. 67 x 12 + 33 x 12
c. 100 x 12 + 100 x 88
a
12 * 13 * 14
= 156 * 14
= 2184
b
67 * 12 +33 * 12
= (67 + 33) * 12
= 100 * 12
= 1200
c
100 * 12 + 100 * 88
= (12+88) * 100
= 100 * 100
= 10000
a . 12 x 13 x 14 b) 67 x 12 + 33 x 12 c) 100 x 12 + 100 x 88
= 156 x 14 = ( 67 + 33 ) x 12 = 100 x ( 12 + 88 )
= 2184 = 100 x 12 = 100 x 100
= 1200 = 10000
a. 12 x 13 x 14 = 2184
b. 67 x 12 + 33 x 12
= (33 + 67) x 12
= 100 x 12
= 1200
c. 100 x 12 + 100 x 88
= 100 x (12 + 88)
= 100 x 100
= 10000
hok tốt!
a,100+(+430)+2145+(-530)
b,(-12) . 15
c,(+12) . 13+13 . (-22)
d,{[14 : (-2)]+7} : 2012
a/ 2145
b/-180
c/-130
d/0
tik nha mk nhanh nhất!
a , 100 + ( + 430 ) + 2145 + ( - 530 ) = 530 + 2145 - 530 = ( 530 - 530 ) + 2145 = 0 + 2145 = 2145
b , ( - 12 ) . 15 = - ( 12 . 15 ) = - 180
c , ( + 12 ) . 13 + 13.( - 22 ) = 13 . [ ( + 12 ) + ( - 22 ) ] = 13 . ( - 10 ) = - 130
d , { [ 14 : ( - 2 ) ] + 7 } : 2012 = { ( - 7 ) + 7 } : 2012 = 0 : 2012 = 0
a,100+(+430)+2145+(-530)=530+1615=2145
b,(-12).15=-180
c,(+12).13+13.(-22)=13(12+-22)=13.-10=-130
d,{[14 : (-2)]+7} : 2012={-7+7}:2012=0:2012=0
+\(\dfrac{1}{3^{100}}\) với
A = \(\dfrac{1}{3}\) + \(\dfrac{1}{3^2}\) + \(\dfrac{1}{3^3}\)+...+ \(\dfrac{1}{3^{99}}\) + \(\dfrac{1}{3^{100}}\)
3A = 1 + \(\dfrac{1}{3}\) + \(\dfrac{1}{3^2}\) + \(\dfrac{1}{3^3}\)+...+ \(\dfrac{1}{3^{99}}\)
3A - A = 1 - \(\dfrac{1}{3^{100}}\)
2A = 1 - \(\dfrac{1}{3^{100}}\)
A = \(\dfrac{1}{2}\) - \(\dfrac{1}{2.3^{100}}\) < \(\dfrac{1}{2}\)
tính
100 + ( + 130 ) + 2145 + ( - 530 )
( - 12 ) . 15
( + 12 ) . 13 + 13 . ( - 22 )
{ [ 14 : ( - 2 ) ] + 7 } : 2012
a, 100 + 130 + 2145 + (-530)
= 230 + 2145 + (-530)
= 2375 + (-530)
= 1845
b, (-12) . 15
= -180
c, 12 . 13 + 13 .(-22)
= 13. [12 + (-22)]
= 13 . (-10)
= -130
d, {[14 : (-2)] + 7} : 2012
= {(-7) + 7 } : 2012
= 0 : 2012
= 0
tick mk nha bn. chúc bn năm mới vui vẻ, ngày 1 xinh đẹp, học giỏi hơn nữa nha!!
1.100+(+130)+2145+(-530)
=230+2145+(-530)
=2375+(-539)
=1836
2.(-12).15
=-60
3.(+12).13+13.(-22)
=13.[(+12)+(-22)]
=13.(-10)
=-130
4.{[14:(-2)]+7}:2012
={-7+7};2012
=0:2012
=0
chúc bạn học tốt !!
100+100:4-50 (6x8-48):(10+11+12+13+14 10000x2+60000 (70000-3000)x2
100+100:4-50
(6x8-48):(10+11+12+13+14 10000x2+60000 )
(70000-3000)x2
Chia 3 phần à ??
100+100:4-50=75
(6 x 8-48):(10+11+12+13+14)=0
10000x2+60000=80000
(70000-3000)x2=134000
\(100+100:4-50=100+25-50=75\)
\(\left(6\cdot8-48\right)\left(10+11+12+13+14\right)=\left(48-48\right)\left(10+11+12+13+14\right)=0\)
S = 12 ; 13 ; 14 ; 15 ........100
Tính tổng S = 12 ; 13 ; 14 ; 15 ; ... ; 100
Số các chữ số ở dãy S là :
( 100 - 12 ) : 1 + 1 = 89 ( số hạng )
Tổng của dãy số S là :
( 100 + 12 ) . 89 : 2 = 4984
Vậy...
tìm x :
12 + 13 + 5 = 100 - x
10 + 40 = 100 - x
- 12 + 13 +5 =100-x
=30=100-x
x=100-30
x=70
12 + 13 + 5 = 100 - x
30 = 100 - x
x = 100 - 30
x = 70
10 + 40 = 100 - x
50 = 100 - x
x = 100 - 50
x = 50
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
12) 17 – 11 – 14 – (-39)
=17-11-14+39
=6-14+39
=-8+39
=31
13) −127 - 18.( 5 - 6)
=-127-18.1
=-145
14) 100 + (+430) + 2145 + (-530)
=530+2145-530
=(530-530)+2145
=0+2145
=2145
15) (+12).13 + 13.(-22)
=13.[12+(-22)]
=13.(-10)
=-130
16) {[14 : (-2)] + 7} : 2012
={-7+7}:2012
=0:2012
=0
17) 13 – 18 – (- 42) - 15
=13-18+42-15
=-5+42-15
=37-15
=22
18) 369 – 4[(-5) + 4.(-8)]
=369-4[-5+(-32)]
=369-4(-37)
=369+148
=517
19) (-12).(-13) +13.(-29)
=12.13+13.(-29)=13.[12+(-29)]=13.(-17)=-221
20) 125 – 4[ 3 – 7.(-2) ]
=125-4[3+14]
=125-4.17
=125-68
=57
21) (-14).9 – 13.(-9)
=(-14).9+13.9
=9.[-14+13]
=9.(-1)
=-9
âm 9 nha bạn
\(\frac{10}{11}x\frac{12}{13}:\frac{50}{51}-\frac{19}{20}x\frac{12}{13}:\frac{101}{102}+\frac{99}{100}\)