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a) 6*1235*20-5*235*24 = 120(1235-235)=120.1000=120000
b) =[145*99+145*1]-[143101*1]=145*[99+1]-145*[101-1]=145*100-143*100=100*[145-143]=100*2=200
k) 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
p) 1235 x 6789 x (630 - 315 x 2) : 1996
= 1235 x 6789 x (630 - 630) : 1996
= 1235 x 6789 x 0 : 1996
= 0
l) 54 x 113 + 45 x 113 + 113
= 113 (54 + 45 + 1)
= 113 x 100
= 11300
u) (500 x 9 - 250 x 18) x (1 + 2 + 3 + ... + 9)
= (2 x 250 x 9 - 250 x 2 x 9) x (1 +2 + 3 + ... + 9)
= 0 x (1 + 2 + 3 + ... + 9)
= 0
\(2b,\)\(54\times47-47\times53-20-27.\)
\(=47\times54-47\times53-47\)
\(=47\times\left(54-53-1\right)\)
\(=47\times0=0\)
\(2c,\)\(10000-47\times72-47\times28\)
\(=100\times100-47\times\left(72+28\right)\)
\(=100\times100-47\times100\)
\(=100\times\left(100-47\right)\)
\(=100\times53=5300\)
2b
54 x 47 - 47 x 53 - 20 - 27 = 47 x ( 54 - 53 ) - 20 - 27 = 47 - 20 - 27 = 47 - ( 20 + 27 ) = 47 - 47 = 0
2c
10000 - 47 x 72 - 47 x 28 = 10000 - 47 x ( 72 - 28 ) = 10000 - 47 x 44 = 10000 - 2068 = 7932
A) 145 x (99 + 1) - 143 x (102 - 1)
= 145 x 100 - 143 x 101 = 145 x 100 - 143 x (100 + 1)
= 100 x (145 - 143) - 143
= 200 - 143 = 57
B) 54 x 47 - 47 x 53 - 20 - 27
= 47 x (54 - 53) - (20 + 27)
= 47 x 1 - 47 = 0
câu c d bạn tự làm nhé tương tự vậy thôi à ( bạn ấn nút đúng giùm nhé )
a.8x427x3+6x573x4
=(8x3)x427+(6x4)x573
=24x427+24x573
=24x(427+573)
=24x1000
=24 000
b.6x1235x20-5x235x24
=(6x20)x1235-(5x24)x235
=120x1235-120x235
=120x(1235-235)
=120x1000
=120 000
c.(145x99+145)-(143x102-143)
=(145x99+145x1)-(143x102-143x1)
=[145x(99+1)]-[143x(102-1)]
=145x100+143x101
=145x100+143x100+143
=100x(145+143)+143
=100x298+143
=29800+143
=29 943
d.54x47-47x53-20-27
=47x(54-53)-20-27
=47x1-20-27
=47-20-27
=27-27
=0
a, = 113 x (54+45+1) = 113 x 100 = 11300
b, = (36+62) x (117-17) = 98 x 100 = 9800
k mk nha
a, 54 x 113 + 54 x 113 + 113
= 113 x ( 54 + 54 + 1 )
= 113 x 109
= 12 317
b, ( 532 x 7 - 266 x 14 ) x ( 532 x 7 + 266 )
= ( 266 x 2 x 7 - 266 x 14 ) - ( 532 x 7 + 266 )
= 266 x ( 2 x 7 - 14 )
= 266 x ( 14 - 14 )
= 266 x 0
= 0
c, 117 x ( 36 + 62 ) - 17 x ( 62 + 36 )
= 117 x 98 - 17 x 98
= 98 x ( 117 - 17 )
= 98 x 100
= 9800
d, ( 145 x 99 + 145 ) - ( 143 x 101 - 143 )
= 145 x ( 99 + 1 ) - 143 x ( 101 - 1 )
= 145 x 100 - 143 x 100
= 14500 - 14300
= 200
e, 45 x 16 - 17
______________
45 x 15 + 28
Ta có : 45 x 16 - 17
= 720 - 17
= 703
Ta có : 45 x 15 + 28
= 675 + 28
= 703
Vậy 45 x 16 - 17 703
______________ = _____________ = 1
45 x 15 + 28 703
( * giải thích thêm : __________ chính là dấu chia đó )
a) 54x113+45x113+113 b)117x(36+62) -17x(62+36)
=(54+45+1)x113 =117x98-17x98
= 100x113 =(117-17)x98
= 11300 =100x98
=9800
a,54 x 113 + 45 x 113 + 113
=(54 + 45 +1) x 113
=100 x 113 = 11300
4 . 113 . 25 - 5 . 112 . 20 = (4 . 25) . 113 - (5 . 20) . 112 = 100 . 113 - 100 . 112 = 100 .(113-112)=100.1=100
54.113+45.113+113=113.(54+45+1)=113.100=11300
54.47-47.53-20-27=47.(54-53)-(20+27)=47.1-47=47-47=0
a)4*113*25-5*112*20
=452*25-560*20
=11300-11200
=100
b)54*113+45*113+113
=6102+5085+113
=11300
C2=113*(54+45)+113
=11187+113
=11300
c)54*47-47*53-20-27
=47*(54-53)-20-27
=47-20-27
0
k nha
thanks