Tính nhanh \(\frac{65+891+135+909}{731-47+69-253}=\)
\(\frac{1994.1993-1992.1993}{1992.1993+1994.7+1986}\) =
1 tính
\(\frac{1994.1993-1992.1993}{1992.1993+1994.7+1986}\)
2.tính nhanh
a,\(\frac{399.45+55.399}{1995.1996-1991.1995}\)
b,\(\frac{1995.1993-18}{1993.1994+1975}\)
1)
\(\frac{1994.1993-1992.1993}{1992.1993+1944.7+1986}\)
\(=\frac{\left(1994-1992\right).1993}{2.1985028+2.6804+2.993}\)
\(=\frac{2.1993}{2.\left(1985028+6804+993\right)}\)
\(=\frac{2.1993}{2.1992825}\)
\(=\frac{193}{1992825}\)
2)
a) \(\frac{399.45+55.399}{1995.1996-1991.1995}\)
\(=\frac{399.\left(45+55\right)}{1995.\left(1996-1991\right)}\)
\(=\frac{399.100}{1995.5}\)\(=4\)
Câu b bài 2 mình không biết làm nữa, xin lỗi nhé!
Tính nhanh biểu thức sau:
A=\(\frac{65+891+135+909}{731-47+69-253}\)
\(A=\frac{65+891+135+909}{731-47+69-253}\)
\(A=\frac{65+135+891+909}{731+69-47-253}\)
\(A=\frac{\left(65+135\right)+\left(891+909\right)}{\left(731+69\right)-\left(47+253\right)}\)
\(A=\frac{200+1800}{800-300}\)
\(A=\frac{2000}{500}=4\)
A = \(\frac{65+891+135+909}{731-47+69-253}\)
A = \(\frac{\left(65+135\right)+\left(891+909\right)}{\left(731+69\right)-\left(47+253\right)}\)
A = \(\frac{200+1800}{800-300}\)
A = \(\frac{2000}{500}\)
A = 4
\(A=\frac{65+891+135+909}{731-47+69-253}\)
\(A=\frac{5\times13+9\times9\times11+5\times27+9\times101}{17\times43-47+23\times3-11\times23}\)
\(A=\frac{5\times13+5\times27+9\times99+9\times101}{17\times43-47-11\times23+23\times3}\)
\(A=\frac{5\times\left(13+27\right)+9\times\left(99+101\right)}{17\times43-47-23\times\left(11-3\right)}\)
\(A=\frac{5\times40+9\times200}{17\times43-47-23\times8}\)
\(A=\frac{2000}{500}\)
\(A=4\)
no tính nhanh đc rùi! cho mk xin lỗi bn nhiều nha!!!!
A=\(\frac{65+891+135+909}{731-47+69-253}\)
Tính nhanh
\(A=\frac{595959}{454545}-\frac{14141414}{15151515}\)
\(B=\frac{65+891+135+909}{731-47+69-253}\)
\(A=\frac{595959}{454545}-\frac{14141414}{15151515}\)
\(A=\frac{595959:10101}{454545:10101}-\frac{14141414:1010101}{15151515:1010101}\)
\(A=\frac{59}{45}-\frac{14}{15}\)
\(A=\frac{59}{45}-\frac{42}{45}=\frac{17}{45}\)
\(B=\frac{65+891+135+909}{731-47+69-253}\)
\(B=\frac{\left(65+135\right)+\left(891+909\right)}{\left(731+69\right)-\left(47+253\right)}\)
\(B=\frac{200+1800}{800-300}=\frac{2000}{500}=4\)
\(A=\frac{595959}{454545}-\frac{14141414}{15151515}\\ A=\frac{595959:10101}{454545:10101}-\frac{14141414:1010101}{15151515:1010101}\\ A=\frac{59}{45}-\frac{14}{15}=\frac{17}{45}\)
\(B=\frac{65+891+135+909}{731-47+69-253}=\frac{\left(65+135\right)+\left(891+909\right)}{\left(731+69\right)-\left(47-253\right)}=\frac{200+1800}{731+69-47+253}=\frac{200+1800}{500}=\frac{2000}{500}=4\)
tính nhanh : 65+891+135+909 phần 731-47+69-253
65+891+135+909 phần 731-47+69-253 = 2000 phần 500 =4
Tính nhanh giá trị biểu thức:
\(\frac{65+891+135+909}{731-47+69-253}\)
Nêu cách làm nhé!
65+891+135+909/731-47+69-253
C=65+891+135+909
731-47+69-253
\(C=\frac{65+891+135+909}{731-47+69-253}\)
\(C=\frac{\left(65+135\right)+\left(891+909\right)}{\left(731+69\right)-\left(47+253\right)}\)
\(C=\frac{200+1800}{800-300}\)
\(C=\frac{2000}{500}=4\)
Ta có:
\(C=\frac{65+891+135+909}{731-47+69-253}\)
\(\Leftrightarrow C=\frac{\left(65+135\right)+\left(891+909\right)}{\left(731+69\right)-\left(47+253\right)}\)
\(\Leftrightarrow C=\frac{200+1800}{800-300}\)
\(\Leftrightarrow C=\frac{2000}{500}=4\)
Tính nhanh giá trị biểu thức sau
65 + 891 + 135 + 909
B = -------------------------------------
731 - 47 + 69 - 253