16*17-5trên 16*16+5
( 16 . 17 - 5 ) : ( 16 . 16 +1 )
Tính nhanh à, sorry nhé! Bài này là 267/257 bạn hé!
Tick cho mink nha.
( 16. 17 - 5 ) : ( 16 . 16 +11)
(16.17-5):(16.16+11)
=(272-5):(256+11)
=267 : 267
= 1
\(\left(16.17-5\right):\left(16.16+11\right)\)
\(\frac{16.17-5}{16.16+11}\)
\(\frac{17-5}{16+11}\)
\(\frac{12}{27}\)
( 16. 17 - 5 ) : ( 16 . 16 +11)
= ( 272 - 5 ) : ( 256 + 11 )
= 267 : 267
= 1
Hok tốt
rút gọn biểu thức 16 . 17 - 5/ 16 .16 + 11
\(16.17-\dfrac{5}{16}\times16+11\)
\(=272-5+11\)
\(=278\)
\(16\cdot17-\dfrac{5}{16}\cdot16+11\\ =16\cdot\left(17-\dfrac{5}{16}\right)+11\\ =16\cdot\dfrac{267}{16}+11\\ =267+11=278\)
Không tính theo thứ tự,hãy so sánh A với B:
A=16*17-5/16*16+11
B=45*16-17/28+45*15
Tính nhẩm:
a)
15 − 6=..... 15 − 7=.....
15 − 8=..... 15 − 9=.....
16 − 7=..... 16 − 8=.....
16 − 9=..... 17 − 8=.....
17 − 9=..... 18 − 9=.....
b)
18 − 8 − 1=..... 18 − 9=.....
15 − 5 − 2=..... 15 − 7=.....
16 − 6 − 3=..... 16 − 9=.....
Phương pháp giải:
Trừ nhẩm các số rồi điền kết quả vào chỗ trống.
Lời giải chi tiết:
a)
15 − 6 = 9 15 − 7 = 8
15 − 8 = 7 15 − 9 = 6
16 − 7 = 9 16 − 8 = 8
16 − 9 = 7 17 − 8 = 9
17 − 9 = 8 18 − 9 = 9
b)
18 − 8 − 1 = 9 18 − 9 = 9
15 − 5 − 2 = 8 15 − 7 = 8
16 − 6 − 3 = 7 16 − 9 = 7
15 - 6 = 9,
15 - 8 =7,
15 - 7 = 8,
15 - 9 = 6
16*17-5
gach ngang
16*16+11
45*17-17
gạch ngang
73+45*15
\(\frac{16×17-5}{16×16+11}\)
\(=\frac{17-5}{16+11}\)
\(=\frac{12}{27}\)
1, \(\frac{16x17-5}{16x16+11}\)
\(=\frac{272-5}{256+11}\)
\(=\frac{267}{267}=1\)
2, \(\frac{45x17-17}{73+45x15}\)
\(=\frac{17x\left(45-1\right)}{73+675}\)
\(=\frac{17x44}{748}\)
\(=\frac{748}{748}=1\)
d/5/16-5/24
e/-24/17-[-7/17-1/16]
f/-11/6+2/5+-1/6
d: \(\dfrac{5}{16}-\dfrac{5}{24}=\dfrac{5\cdot3}{48}-\dfrac{5\cdot2}{48}=\dfrac{5}{48}\)
e: \(-\dfrac{24}{17}-\left(-\dfrac{7}{17}-\dfrac{1}{16}\right)\)
\(=-\dfrac{24}{17}+\dfrac{7}{17}+\dfrac{1}{16}=-1+\dfrac{1}{16}\)
\(=-\dfrac{15}{16}\)
f: \(\dfrac{-11}{6}+\dfrac{2}{5}+\dfrac{-1}{6}\)
\(=\left(-\dfrac{11}{6}-\dfrac{1}{6}\right)+\dfrac{2}{5}\)
\(=-2+\dfrac{2}{5}=\dfrac{-8}{5}\)
Tinh\(\frac{\frac{5}{12}+\frac{3}{4}-1}{3-\frac{5}{6}+\frac{2}{3}}+\frac{\frac{16}{5}+\frac{16}{6}-\frac{16}{7}}{\frac{17}{5}+\frac{17}{6}-\frac{17}{7}}\)
Cac ban giup mik voi, mik k cho! ( 10 k cho 3 nguoi dau tien tra loi cau hoi cua mik)
\(=\frac{\frac{5}{12}+\frac{9}{12}-\frac{12}{12}}{\frac{36}{12}-\frac{10}{12}+\frac{8}{12}}+\frac{16\left(\frac{1}{5}+\frac{1}{6}-\frac{1}{7}\right).}{17\left(\frac{1}{5}+\frac{1}{6}-\frac{1}{7}\right).}\)
\(=\frac{1}{\frac{6}{\frac{17}{6}}}+\frac{16}{17}\)\(=\frac{1}{17}+\frac{16}{17}=1\)
Tính bằng cách thuận tiện nhất .
\(\frac{39}{16}:\frac{5}{8}-\frac{17}{16}:\frac{5}{18}+\frac{4}{5}\)
\(\frac{16}{17}x\frac{12}{19}+\frac{16}{17}x\frac{7}{19}-\frac{2}{3}\)
Trả lời
Sửa đề câu a 1 tí
a)39/16:5/8-17/16:5/8+4/5
=(39/16-17/16):5/8+4/5
=11/8:5/8+4/5
=11/5+4/5
=15/5=3
b)16/17.12/19+16/17.7/19-2/3
=16/17.(12/19+7/19)-2/3
=16/17-2/3
=48/56-14/56
=34/56=17/28
Học tốt !