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2 x 18 x 14 + 3 x 17 x 12 + 4 x 69 x 9
=(2 x 18) x 14 + (3 x 12) x 17 + (4 x 9) x 69
=36 x 4 + 36 x 17 + 36 x 69
= 36x( 4+17+69)
=36x100
=3600
Chúc bạn học tốt ^_^
2 x 18 x 14 + 3 x 17 x 12 + 4 x 69 x 9
=(2 x 18) x 14 + (3 x 12) x 17 + (4 x 9) x 69
=36 x 4 + 36 x 17 + 36 x 69
= 36x( 4+17+69)
=36x100+
=3600
Tính nhanh:
a,-69+53+46+(-94)+(-14)+78
= -16 + 46 - 94 + (-14) + 78
= 30 - 94 + (-14) + 78
=-64 + (-14) + 78
= -78 + 78
= 0
b,13-12+11+10-9+8-7-6+5-4+3+2-1
= 13 - ( 12 + 1 ) - ( 11 + 2 ) - ( 10 - 3 ) - ( 9 + 4 ) - ( 8 + 5 ) - ( 7 + 6 )
= 13 - 13 - 13 - 13 - 13 - 13 + 13
= 0 + 13
= 13
học tốt ạ
a. ( 23 - 21) + ( 19 - 17) + ( 15 - 13) + ( 11 - 9) + ( 7 - 5) + ( 3 - 1)
= 2 + 2 + 2 + 2 + 2 + 2
= 2 x 6
= 12
b. ( 24 - 22 ) + ( 20 - 18 ) + ( 16 - 14 ) + ( 12 - 10) + ( 8 - 6 ) + ( 4 - 2)
= 2 + 2 + 2 + 2 + 2 + 2
= 2 x 6
= 12
a) \(\dfrac{3}{8}+\dfrac{7}{12}+\dfrac{10}{16}+\dfrac{10}{24}\)
\(=\dfrac{3}{8}+\dfrac{7}{12}+\dfrac{5}{8}+\dfrac{5}{12}\)
\(=\left(\dfrac{3}{8}+\dfrac{5}{8}\right)+\left(\dfrac{7}{12}+\dfrac{5}{12}\right)\)
\(=1+1\)
\(=2\)
b) \(\dfrac{4}{6}+\dfrac{7}{13}+\dfrac{17}{9}+\dfrac{19}{13}+\dfrac{1}{9}+\dfrac{14}{6}\)
\(=\dfrac{2}{3}+\dfrac{7}{13}+\dfrac{17}{9}+\dfrac{19}{13}+\dfrac{1}{9}+\dfrac{7}{3}\)
\(=\left(\dfrac{2}{3}+\dfrac{7}{3}\right)+\left(\dfrac{7}{13}+\dfrac{19}{13}\right)+\left(\dfrac{17}{9}+\dfrac{1}{9}\right)\)
\(=3+2+2\)
\(=7\)
c) \(\dfrac{1}{2}+\dfrac{1}{6}+\dfrac{1}{12}+\dfrac{1}{20}+\dfrac{1}{30}+\dfrac{1}{42}+\dfrac{1}{56}\)
\(=\dfrac{1}{1\cdot2}+\dfrac{1}{2\cdot3}+\dfrac{1}{3\cdot4}+\dfrac{1}{4\cdot5}+\dfrac{1}{5\cdot6}+\dfrac{1}{6\cdot7}\)
\(=1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{6}+\dfrac{1}{6}-\dfrac{1}{7}\)
\(=1-\dfrac{1}{7}\)
\(=\dfrac{6}{7}\)
2 x 18 x 14 + 3 x 17 x 12 + 4 x 69 x 6
= (2 x 18) x 14 + (3 x 12) x 17 + (4 x 6) x 69
= 36 x (14 + 17 + 69)
= 36 x 100
= 3600
\(2.18.14+3.17.12+4.69.6\)
\(=\left(2.18\right).14+\left(3.12\right).17+\left(4.6\right).69\)
\(=36.14+36.17+24.69\)
\(=36.\left(14+17\right)+24.69\)
\(=36.31+24.69\)
\(=4.9.31+4.6.69\)
\(=4.\left(9.31+6.69\right)\)
\(=4.\left(279+414\right)\)
\(=4.693\)
\(=2772\)
Jennie Kim làm sai từ dòng thứ 3 rồi nha bn
~ Rất vui vì giúp đc bn ~
1) \(\left(+15\right)+\left(+17\right)=15+17=32\)
2) \(\left(-3\right)+\left(-7\right)=-3-7=-\left(3+7\right)=-10\)
3) \(\left(-25\right)+\left(+4\right)=-25+4=-\left(25-4\right)=-21\)
4) \(\left(-6\right)+\left(-54\right)=-6-54=-\left(6+54\right)=-60\)
5) \(\left(-15\right)+20=20-15=5\)
6) \(\left(-5\right)+8+7+5\)
\(=\left(-5+5\right)+\left(8+7\right)\)
\(=15\)
7) \(\left(-8\right)+\left(-11\right)+\left(-2\right)\)
\(=\left[\left(-8\right)+\left(-2\right)\right]+\left(-11\right)\)
\(=\left(-10\right)+\left(-11\right)\)
\(=-21\)
8) \(15+\left(-5\right)+\left(-14\right)+\left(-16\right)\)
\(=\left[15+\left(-5\right)\right]+\left[\left(-14\right)+\left(-16\right)\right]\)
\(=10+\left(-30\right)\)
\(=-20\)
9) \(\left(-20\right)+\left(-14\right)+3+\left(-86\right)\)
\(=\left[\left(-20\right)+3\right]+\left[\left(-14\right)+\left(-86\right)\right]\)
\(=\left(-17\right)+\left(-100\right)\)
\(=-117\)
10) \(\left(-136\right)+123+\left(-264\right)+\left(-83\right)+240\)
\(=\left[\left(-136\right)+\left(-264\right)\right]+\left[123+\left(-83\right)\right]+240\)
\(=\left(-400\right)+40+240\)
\(=\left(-360\right)+240\)
\(=-120\)
11) \(\left(-596\right)+2001+1999+\left(-404+189\right)\)
\(=\left(-596\right)+2001+1999-404+189\)
\(=\left[\left(-596\right)-404\right]+\left(2001+189\right)+1999\)
\(=\left(-1000\right)+2190+1999\)
\(=1190+1999\)
\(=3189\)
12) \(314+\left(-153\right)+64+121+\left(-247\right)+218\)
\(=\left(314+64+121\right)+\left[\left(-153\right)+\left(-247\right)\right]+218\)
\(=\left(378+121\right)+\left(-400\right)+218\)
\(=499-400+218\)
\(=99+218\)
\(=317\)
\(\text{#}Toru\)
a) -37 + 54 + (-70) + (-163) +246
= (-37-163) + (54+246) - 70
= -200 + 300 -70
= 30
chuc bn hoc tot
=3320
Lik e mình nha
=3320