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1. ( 8374+3476 )+(8397+8943)+(9558+9482)+(9385+8475)
=11850+17340+19040+17860
=66090
2.(848+932)+(938+972)+(837+263)+(846x2)
=1780+1910+1100+1692
=6482
tick cho mình nha
= ( 25153 + 847 ) + ( 14424 + 576 )
= 26000 + 15000
= 41000
72+275 +176 +548 +324 +725 +452+928
=(72+928)+(275+725)+(176+324)+(548+452)
=1000+1000+500+1000
=3500
\(a,25\times47\times4\times2=\left(25\times4\right)\times\left(47\times2\right)=100\times94=9400\\ b,865\times99+865=865\times\left(99+1\right)=865\times100=86500\\ c,472\times1002-472-472=472\times\left(1002-1-1\right)=472\times1000=472000\\ d,2478+10275+7522-275=\left(2478+7522\right)+\left(10275-275\right)=10000+10000=20000\)
1.:892;726;862;762;872
2:825;290;830;370;920
3:762;987;627;837;
4:126;999;837;927;333;
1:892,726,862,762,872
2:825,290,830,370,920
3:987,627,517,913,837,821,837,917
4:126,938,726,948,999,762,837,927,333,872,827
1.
= 10 000 - 29 x 11
= 10 000 - 319
= 9681
2.
= ( 3/7 + 4/7 ) + ( 4/9 + 5/9 )
= 1 + 1
= 2
1) a) 387 x 15 + 387 x 39 = 387 x (15+39) = 387 x 54 = 20898
b) 258 x 2 x 5 = 258 x 10 = 2580
c) 125 x 25 x 4 x 8 = 125 x 8 x 25 x 4 = 1000 x 100 = 100000
123 × 97 + 2 × 123 + 123 = 123 x ( 97 + 2 + 1) = 123 x 100 = 12300
123 x 97 + 2 x 123 + 123
= 123 x 97 + 2 x 123 + 123 x 1
= 123 x ( 97 + 2 +1 )
= 123 x 100
= 12300.
N H Ớ T I C K C H O M Ì N H N H A
~ HT~
\(\frac{3}{4}\cdot\frac{5}{7}+\frac{5}{7}\cdot\frac{1}{4}=\left(\frac{3}{4}+\frac{1}{4}\right)\cdot\frac{5}{7}=\frac{4}{4}\cdot\frac{5}{7}=1\cdot\frac{5}{7}=\frac{5}{7}\)
(lưu ý dấu . là x nhân ý)
Chúc bạn học tốt!^_^
1: \(939472+928720+846948+387049+837861+847840\)
\(=\left(939472+846948\right)+\left(928720+847840\right)+\left(387049+837861\right)\)
=1786420+1776560+1224910
=4787890
2:
\(38457+8488375+4849573+746503\)
\(=38457+746503+8488375+4849573\)
\(=784960+13337948=14122908\)