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a) 18 +29 + 158 - 18 - 29
b) 13-135+49+13-49
rồi tính đi
tick mik nha
\(a,357-1284+1280-1357\)
\(=\left(357-1357\right)+\left(-1284+1280\right)\)
\(=-1000-4\)
\(=-1004\)
\(b,1-4-7+10+13-16-19+22-25+28+31-34+37\)
\(=\left(1-4\right)+\left(-7+10\right)+\left(13-16\right)+\left(-19+22\right)+\left(-25+28\right)+\left(31-34\right)+37\)
\(=-3+3-3+3+3-3+37\)
\(=37\)
a) 357-1284+1280-1357
=(1357-357)-(1284-1280)
=1000-4
=996
b)
\(\dfrac{7}{9}\cdot\dfrac{3}{35}=\dfrac{7}{3\cdot3}\cdot\dfrac{3}{7\cdot5}=\dfrac{1}{15}\)
\(\dfrac{9}{22}\cdot55=\dfrac{9}{11\cdot2}\cdot11\cdot5=\dfrac{45}{2}\)
\(\dfrac{11}{17}:\dfrac{33}{34}=\dfrac{11}{17}\cdot\dfrac{34}{33}=\dfrac{11\cdot17\cdot2}{17\cdot11\cdot3}=\dfrac{2}{3}\)
a) 683\(\times\) 35=23906
1954\(\times\) 425=830450
2438\(\times\) 306=746028
b) \(\dfrac{7}{9}\times\dfrac{3}{35}=\dfrac{7\times3}{9\times35}=\dfrac{1}{15}\)
\(\dfrac{9}{22}\times55=\dfrac{9\times55}{22}=\dfrac{45}{2}\)
\(\dfrac{11}{17}:\dfrac{33}{34}=\dfrac{11}{17}\times\dfrac{34}{33}=\dfrac{11\times34}{17\times33}=\dfrac{2}{3}\)
c) 36,66:7,8=4,7
15,7:6,28=2,5
27,63:0,45=61,4
d) 16 giờ 15 phút:5=3 giờ 15 phút
14 phút 36 giây:12=1 phút 13 giây
Câu 2:
\(\dfrac{7}{9}\cdot\dfrac{3}{35}=\dfrac{1}{5}\cdot\dfrac{1}{3}=\dfrac{1}{15}\)
\(\dfrac{9}{22}\cdot55=\dfrac{9\cdot55}{22}=\dfrac{9\cdot5}{2}=\dfrac{45}{2}\)
a: =9/13+4/13+2/9+7/9
=1+1
=2
b: =(44-17-23)/55
=4/55
c: =100+19,25
=119,25
d: =98,3-38
=60,3
17-(35+22-44)+(55-56)
=17-35-22+44+55-56
=(-18)-22+44+55-56
=(-40)+44+55-56
=4+55-56
=59-56
=3
17-(35+22-44)+(55-56)
=17-35-22+44+55-66
=-7