k) 4 x 113 x 25 - 5 x 112 x 20
p) 1235 x 6789 x ( 630 - 315 x 2 ) :1996
l) 54 x 113 + 45 x 113 + 113
u) ( 500 x 9 - 250 x 18 ) x ( 1 +2 +3 +.......+ 9 )
1:tính bằng cách thuận tiện nhất:
a)54 x 113 + 45 x 113 + 113 b)3/7 + 4/9 + 8/14 + 10/18
2:tính giá trị biểu thức
a)9/5 - 1/2 + 1/3
b)12/9 x 1/12 + 1/6 x 12/9
c)3/4 x (5/6 + 2/3)
d)3/2 - 2/3 : 2
1.a,=(54+45+1).113
=100.113
=11300
b,=(3/7+8/14)+(4/9+10/18)
=1+1
=2
2.a,=13/10+1/3
=49/30
b,=12/9.(1/12+1/6)
=12/9.1/4
=1/3
c,=3/4.3/2
=9/8
d,=3/2-1/3
=7/6
1:tính bằng cách thuận tiện nhất:
a)54 x 113 + 45 x 113 + 113
= 54 x 113 + 45 x 113 + 113x1
=113 x(54+45+1)
= 113x100
=1300
b)3/7 + 4/9 + 8/14 + 10/18
=(3/7+8/14)+(4/9+10/18)
= 1 + 1
=2
Tính nhanh:
54 x 113 + 45 x 113 + 113
54 x 47 - 47 x 53 - 20 - 27
10000 - 47 x 72 - 47 x 28
(145 x 99 + 145) - (143 x 101 - 143)
1002 x 9 - 18
8 x 427 x 3 + 6 x 573 x 4
2008 x 867 + 2009 x 133
a/ = 113 x ( 54 + 45 + 1 ) = 113 x 100 = 11300
b/ = 47 x ( 54 - 53 ) - 20 - 27 = 47 - 20 - 27 = 0
c/ = 145 x ( 99 + 1 ) - 143 x ( 101 - 1 ) = 145 x 100 - 143 x 100 = 100 x ( 145 - 143 ) = 100 x 2 = 200
d/ = 1002 x 9 - 2 x 9 = 9 x ( 1002 - 2 ) = 9 x 1000 = 9000
e/ = 24 x 427 + 24 x 573 = 24 x ( 427 + 573 ) = 24 x 1000 = 24000
f/ Sửa đề bài là :
2008 x 867 + 2008 x 133 = 2008 x ( 867 + 133 ) = 2008 x 1000 = 2008000
Tính nhanh
a, 54 x 113 + 45 x 113 + 113
b, 3 x 7/10 + 7/10 x 5 + 2 x 14/20
a,
= 113 x (54 + 45 + 1)
= 113 x 100
= 11300
b,
= 7/10 x (3 + 5 + 2)
= 7/10 x 10
= 7
a, 54 x 113 + 45 x 113 + 113
= 113 x ( 54+45+1)
= 113 x 100
= 11300
b, 3 x 7/10 + 7/10 x 5 + 2 x 14/20
= 7/10 + ( 3+5+2)
= 7/10 x 10
= 7
tính bằng cách thuận tiện nhất
1235 x 6789 x ( 630 - 315 x 2 )
( 100 + 67 ) x 67 + ( 200 - 33 ) x 33
72 + 36 x 2 + 24 x 3 + 18 x 4 +12 x 2 +168
\(1235\text{×}6789\text{×}\left(630-315\text{×}2\right)\)
\(=1235\text{×}6789\text{×}\left(630-630\right)\)
\(=1235\text{×}6789\text{×}0=0\)
\(\left(100+67\right)\text{×}67+\left(200-38\right)\text{×}33\)
\(=167\text{×}67+167\text{×}33\)
\(=167\text{×}\left(67+33\right)\)
\(=167\text{×}100=16700\)
\(72+36\text{×}2+24\text{×}3+18\text{×}4+12\text{×}2+168\)
\(=72+72+72+72+24+168\)
\(=\left(72\text{×}4\right)+24+168=288+24+168=480\)
a) \(1235\times6789\times\left(630-630\right)\)
\(=1235\times6789\times0\)
\(=1235\times0\)
\(=0\)
b) \(167\times67+167\times33\)
\(=167\times\left(67+33\right)\)
\(=167\times100\)
=16700
Bµi 1 1 37064 – 64 x 82 42966 217 2 320 – 120.5 95,25 5,25 874 12 x 12,53 132 x 9 132 4 48 x 17 48 x 3 5 56 x 27 56 x 35 62 6 45 x 48 – 90 x 24 145 7 754 x 75 – 2262 x 25 4568 8 1050 15 – 350 5 1769 4320 9 – 8640 18 750 10 316 192 384 321 108 11 24 25 26 ….. 124 125 126 12 154 – 153 152 – 151 150 – 149 ….. 4 – 3 2 – 113 37 x 38 – 19 x 74 1000 14 0.48 x 500 – 2.4 x 40 x 2
Tính nhanh
a. 54 x 113 + 45 x 113 + 113
b. 54 x 47 - 47 x 53 - 20 - 27
a. 54 x 113 + 45 x 113 + 113
= 113 x (54 + 45 + 1)
= 113 x 100 = 11300
Vậy giá trị cần tìmlaf: 11300
b. 54 x 47 - 47 x 53 - 20 - 27
= 54 x 47 - 47 x 53 - (20 + 27)
= 54 x 47 - 47 x 53 - 47
= 47 x (54 - 53 - 1)
= 47 x 0 = 0
Vậy giá trị cần tìm là: 0
\(a,54\times113+45\times113+113\\ =113\times\left(54+45+1\right)\\ =113\times100=11300\)
\(b,54\times47-47\times53-20-27\\ =54\times47-47\times53-47\\ =47\times\left(54-53-1\right)\\ =47\times0=0\)
4 x 113 x 25-5 x 112 x 20
a) x+ (x+1)+(x+2)+(x+3)+..........+ 112+ 113= 113
b) x+ (x+1)+ (x+2)+(x+3)+..........+( x + 222)=224x
giải gấp cho mik nha.
tính nhanh:
4 x 113 x 25 - 5 x 112 x 20
4 x 113 x 25 - 5 x 112 x 20
= 4 x 25 x 113 - 5 x 20 x 112
= 100 x 113 - 100 x 112
= 100 x (113 - 112)
= 100 x 1
= 100
4 x 113 x 25 - 5 x 112 x 20
= 4 x 25 x 113 - 5 x 20 x 112
= 100 x 113 - 100 x 112
= 100 x (113 - 112)
= 100 x 1
= 100
Cách 1: 4 x 113 x 25 - 5 x 112 x 20
= (25 x 4) x 113 - (5 x 20) x 112
= 100 x 113 - 100 x 112
= 11300 - 11200
= 100
Cách 2: 4 x 113 x 25 - 5 x 112 x 20
= (25 x 4) x 113 - (5 x 20) x 112
= 100 x (113 - 112)
= 100 x 1
= 100