( 49 . 42- 47 . 42) : 42
42. 53 + 47. 156 - 47. 114
53. ( 51 + 4 ) + 53. ( 49 + 96 ) + 53
42. ( 15 + 96 ) + 6. ( 25 +4 ). 7
1, 42 x 53 + 47 x 156 - 47 x 114
= 42 x 53 + 47 x ( 156 - 114 )
= 42 x 53 + 47 x 42
= 42 x ( 53 + 47 )
= 42 x 100
= 4200
2, 53 x ( 51 + 4 ) + 53 x ( 49 + 96 ) + 53
= 53 x 51 + 53 x 4 + 53 x 49 + 53 x 96
= 53 x ( 51 + 49 ) + 53 x ( 96 + 4 ) + 53
= 53 x 100 + 53 x 100 + 53
= 5300 + 5300 + 53
= 10653
3, 42 x ( 15 + 96 ) + 6 x ( 25 + 4 ) x 7
= 42 x 15 + 42 x 96 + 42 x 25 + 42 x 4
= 42 x ( 15 + 25 ) + 42 x ( 96 + 4 )
= 42 x 40 + 42 x 100
= 42 x ( 100 + 40 )
= 42 x 140
= 5880
Tk mk nha !! ~
42. 53 + 47. 156 - 47. 114 = 42.53 +47.(156-114)
=42.53 +47. 42
= 42(53+47)
= 42.100 = 4200
53. ( 51 + 4 ) + 53. ( 49 + 96 ) + 53 = 53(51+4+49+96+1)
= 53. 201 = 10653
42. ( 15 + 96 ) + 6. ( 25 +4 ). 7 = 42. ( 15 + 96 ) + 42(25+4)
= 42(15+96+25+4)
= 42. 140 = 5880
mk lm xong rồi add friend nha
TRẢ LỜI:
A/ 42 . 53 + 47 . 156 - 47 . 114
=2226 + 7332 - 5358
=9558 - 5358
=4200
B/ 53 . (51 + 4) + 53 .(49 + 96) + 53
=53 . 51 + 53 . 4+ 53. 49+ 53. 96+ 53
=2703 + 212 +2597 +5088 + 53
=2924 + 7738
=10662
C/ 42.(15+96)+6.(25+4).7
=42. 15+42. 96+6 . 25+6.4.7
=630+4032+150+168
=4980
CHÚC BN HOK TỐT
a.14×99
b.7989×997
c.15373×9998
d.42×53+47×156×47×114
e.5×77×7-7×60+49×25-15×42
a) 1 386
b) 7 965 033
c) 153 699 254
d) 1 846 390 458
e) 2 870
a.14×99
b.7989×997
c.15373×9998
d.42×53+47×156×47×114
e.5×77×7-7×60+49×25-15×42
a) 1 386
b) 7 965 033
c) 153 699 254
d) 1 846 390 458
e) 2 870
\(\left(a\right)14.99=1386\)
\(\left(b\right)7989x997=7965033\)
\(\left(c\right)15373.9998=153699254\)
\(\left(d\right)42.53+47.156.47.114=1846390458\)
\(\left(e\right)5.77.7-7.60+49.25-15.42=2870\)
Tính : 50+49-48+47-46+45-43+42-41+40=?
50+49-48+47-46+45-44+43-42+41-40
50+49-48+47-46+45-44+43-42+41-40
= 50+1+1+1+1+1
=55
50+49-48+47-46+45-44+43-42+41-40=?
50+49-48+47-46+45-44+43-42+41-40
50+(49-48)+(47-46)+(45-44)+(43-42)+(41-40)
50+1+1+1+1+1
55
tính nhanh : 41 + 42 + 43 + 44 + 45 + 46 + 47 + 48 + 49
41 + 42 + 43 + 44 + 45 + 46 + 47 + 48 + 49
=(49+41).[(49-41):2] +45
=90.4+45
=360+45
=405
tính:50+49-48+47-46+45-44+43-42+41-40=
đáp số là 55 k mình đi mình đang bị âm huhu
Tính: 50 + 49 – 48 + 47 – 46 + 45 – 44 + 43 – 42 + 41 – 40 =
\(50+49-48+47-46+45-44+43-42+41-40\)
\(=50+\left(49-48\right)+\left(47-46\right)+\left(45-44\right)+\left(43-42\right)+\left(41-40\right)\)
\(=50+1+1+1+1+1\)
\(=50+\left(1.5\right)\)
\(=50+5\)
\(=55\)
41+42+43+44+45+46+47+48+49+50
(đề bài)
=(41+49)+(42+48)+(43+47)+(44+46)+(45+50)
= 90 + 90 + 90 +90 +90+5
= 5.90 +5
= 450 +5
=455