X + 36 = 78
Thực hiện phép tính sau
a. 36 x 12 + 36 x 45 + 36 x 33..
b. 78 x 31 + 78 x 24 +78 x 17 + 22 x 72
c. ( 34 - 17 )2 - 23 x 32
d. 1120 : 1119 + 30 x 32
e. ( 22 )3 - 33
trình bày luôn nha
36 x 12 + 36 x 45 + 36 x 33
= 36 x (12 + 45 + 33)
= 36 x 90
= 3240
b) 78 x 31 + 78 x 24 + 78 x 17 + 22 x 72
=78 x (31 + 24 + 17) + 22 x 72
= 78 x 72 + 22 x 72
= (78 + 22) x 72
= 100 x 72
= 7200
c) ( 34 - 17 )2 - 23 x 32
\(=17^2-8.9\)
\(=289-72\)
\(=217\)
d)1120 : 1119 + 30 x 32
\(=11^{20-19}+0\cdot9\)
\(=11+0\)
\(=11\)
bài 1 : tính nhanh
a, 23 + 25 + 27 + 29 + 31 + 33 + 35
b, 4 . 36 . 25 . 50
c, 32 . 125 . 3
d, 36 . 19 + 36 . 81
e, 78 . 31 + 78 . 24 + 78 . 17 + 22 x 72
Ai làm nhanh mình tik, giải rõ giúp mình, mình cảm ơn
a) 23 + 25 + 27 + 29 + 31 + 33 + 35
= 23 + ( 25 + 35 ) + ( 27 + 33 ) + ( 29 + 31 )
= 23 + 60 + 60 + 60
= 23 + 60 x 3
= 23 + 180
= 203
b) 4 . 36 . 25 . 50
= 4 . 4 .9 . 25 . 25 . 2
= 4 . 25 . 4 . 25 . 9 . 2
= 100 . 100 . 9 . 2
= 10 000 . 18
= 180 000
c) 32 . 125 . 3
= 4 . 8 . 5 . 25 . 3
= 4 . 25 . 8 . 5 . 3
= 100 . 8 . 5 . 3
= 800 . 5 . 3
= 4000 . 3
= 12000
d, 36 . 19 + 36 . 81
= 36 . ( 19 + 81 )
= 36 . 100
= 3600
e, 78 . 31 + 78 . 24 + 78 . 17 + 22 x 72
= 78 . ( 31 + 24 + 17 ) + 22 x 72
= 78 . 72 + 22 . 72
= 72 . ( 78 + 22 )
= 72 . 100
= 7200
A)23+25+27+29+31+33+35
= (33+27)+(25+35)+(29+31)+23
=60+60+60+23
=60x3+23
=180+23
=203
B)4.36.25.50=(36.25).(4.50)
=(4.9.25).(2.2.50)
=(4.25).9 .(2.50).2
=100.9.100.2
=100.(9+2)
=100 .11
=1100
C)32.125.3=(4.8).125.3
=(125.8).(4.3)
=1000.12
=12000
D)36.19.36.81=36.(19+81)
= 36.100
=3600
E)78.31.+78.24+78.17+22x72=78.31+78.24+78.17+ (16+6).72
=78.31+78.24+78.17+78.16
=78.(31+24+17+16)
=78.88
=6864
13,5 : 142 - 4,5 x 78 x 3 + 1,5 x 36 x 9
Tính bằng cách hợp lý:
A = 512 x 4 + 512 x 58
B = 312 x 36 - 312 x 26
C = 745 x 11 - 745
D = 837 x 15 - 837 x 5
E = 578 x 78 - 578 x 14 + 578 x 36
F = 645 x 78 + 645 x 22
A = 512 x 4 + 512 x 58
A = 512 x (4 + 58)
A = 512 x 62
A = 31 744
B = 312 x 36 - 312 x 26
B = 312 x (36 - 26)
B = 312 x 10
B = 3120
C = 745 x 11 - 745
C = 745 x (11 - 1)
C = 745 x 10
C = 7450
D = 837 x 15 - 837 x 5
D = 837 x (15 - 5)
D = 837 x 10
D = 8370
E = 578 x 78 - 578 x 14 + 578 x 36
E = 578 x (78 - 14 + 36)
E = 578 x 100
E = 57 800
F = 645 x 78 + 645 x 22
F = 645 x (78 + 22)
F = 645 x 100
F = 64 500
\(\text{B = 312 x 36 - 312 x 26}\)
\(B=312\times\left(36-26\right)\)
\(B=312\times10\)
\(B=3120\)
24/18 x 36/30 x 50/44 x 66/60 x 84/78 x 104/98
Tính giá trị biểu thức:
24680 + 752 x 306
14570 - 1988 : 14
9144 : 36 x 78
\(24680+752\times306\)
\(=24680+230112\)
\(=254792\)
--------------------------
\(14570-1988:14\)
\(=14570-142\)
\(=14428\)
--------------------------
\(9144:36\times78\)
\(=254\times78\)
\(=19812\)
x/6 + x/10 + x/15 + x/21 + x/28 + x/36 +x/45 + x/55 + x/ 66 + x/78 = 220/39
x.(\(\dfrac{1}{6}\)+\(\dfrac{1}{10}\)+\(\dfrac{1}{15}\)+\(\dfrac{1}{21}\)+\(\dfrac{1}{28}\)+\(\dfrac{1}{36}\)+\(\dfrac{1}{45}\)+\(\dfrac{1}{55}\)+\(\dfrac{1}{66}\)+\(\dfrac{1}{78}\))=\(\dfrac{220}{39}\)
x.\(\dfrac{20}{39}\)=\(\dfrac{220}{39}\)
x=\(\dfrac{220}{39}\):\(\dfrac{20}{39}\)
x=11
m
lppkokoko
tìm x biết \(\frac{x}{6}+\frac{x}{10}+\frac{x}{15}+\frac{x}{21}+\frac{x}{28}+\frac{x}{36}+\frac{x}{45}+\frac{x}{55}+\frac{x}{66}+\frac{x}{78}+\frac{x}{78}=\frac{220}{39}\)
\(\frac{x}{6}+\frac{x}{10}+\frac{x}{15}+\frac{x}{21}+\frac{x}{28}+\frac{x}{36}+\frac{x}{45}+\frac{x}{55}+\frac{x}{66}+\frac{x}{78}+\frac{x}{78}=\frac{220}{39}\)
\(\Leftrightarrow x\left(\frac{1}{6}+\frac{1}{10}+\frac{1}{15}+\frac{1}{21}+\frac{1}{28}+\frac{1}{36}+\frac{1}{45}+\frac{1}{55}+\frac{1}{66}+\frac{1}{78}+\frac{1}{78}\right)=\frac{220}{39}\)
\(\Leftrightarrow x\cdot\frac{20}{39}=\frac{220}{39}\Rightarrow x=11\)
\(\frac{x}{6}+\frac{x}{10}+\frac{x}{15}+\frac{x}{21}+\frac{x}{28}+\frac{x}{36}+\frac{x}{45}+\frac{x}{55}+\frac{x}{66}+\frac{x}{78}+\frac{x}{78}=\frac{220}{39}\)
\(=>x=\frac{1}{6}+\frac{1}{10}+\frac{1}{15}+\frac{1}{21}+\frac{1}{28}+\frac{1}{36}+\frac{1}{45}+\frac{1}{55}+\frac{1}{66}+\frac{1}{78}+\frac{1}{78}=\frac{220}{39}\)
\(x\cdot\frac{20}{39}=\frac{220}{39}\)
\(x=\frac{220}{39}:\frac{20}{39}=11\)
Trong các hiệu sau, hiệu nào chia hết cho 3 :
A. 3678 - 175
B. 3478 - 945
C. 3678 - 245
D. 3678 - 945
Bn giakun ơi ! Bn trả lời bị sai rồi nhé !