tính 15.{32:[6-5+5.(9:3)]}
tính 15.{32:[6-5+5.(9:3)]}
Tính : 15 . {32 : [6-5+5. (9 :3) ] }
thực hiện phép tính 15.{32:[6-5+5(9:3)]}
15.{32:[6-5+5(9:3)]}
=15.{32:[1+5.3]}
=15.{32:[1+15]}
=15.{32:16}
=15.2
=30
BÀI 1 : TÍNH NHANH
A) (1/9 - 9/17 ) + 3/6 - (12/17 - 1/2 ) + 5/9
B) 7/32 × ( -9/12 - 16/30 ) - ( 7/32 - 15 )
C) 3/10 × ( -5/9 + 3/5 ) - 3/10 × ( 3/9 + -2/5 )
D) -2/5 × ( 5/17 - 9/15 ) - 2/5 × ( 2/17 + -2/5 )
E) [ -5/13 - ( 3/5 +3/13 - 4/10 ) ] ÷ -15/11
G) 2/19 × ( -9/27 × 54/63 ÷ 5/7 )
Bài 1 Tính nhanh
a) -3/7 + 5/13 + 3/7
b) -5/21+-2/21+8/24
c) -5/11+(-6/11+2)
d) (-1/32+1/2)+15/32
e)5/17+ -6/13 + 3/4 + 7/-13+12/17
f) 7/23+-18/18+-4/9+16/23+-5/8
g)1/3+-3/4+3/5+-1/36+1/15+-2/9
h)-1/2+1/3+-1/4+-2/8+4/18+4/9
a)\(-\dfrac{3}{7}+\dfrac{5}{13}+\dfrac{3}{7}\)
=\(\left(-\dfrac{3}{7}+\dfrac{3}{7}\right)+\dfrac{5}{13}\)
=\(0+\dfrac{5}{13}\)
=\(\dfrac{5}{13}\)
1, Tính
3/8+15/32
8/9-5/36
15/6-7/4+2
3-(3/4+5/12)
\(\frac{3}{8}+\frac{15}{32}=\frac{12}{32}+\frac{15}{32}=\frac{27}{32}\)
\(\frac{8}{9}-\frac{5}{36}=\frac{32}{36}-\frac{5}{36}=\frac{27}{36}=\frac{3}{4}\)
\(\frac{15}{6}-\frac{7}{4}+2=\frac{30}{12}-\frac{28}{12}+\frac{24}{12}=\frac{26}{12}=\frac{13}{6}\)
\(3-\left(\frac{3}{4}+\frac{5}{12}\right)=3-\left(\frac{9}{12}+\frac{5}{12}\right)=3-\frac{14}{12}=3-\frac{7}{6}=\frac{18}{6}-\frac{7}{6}=\frac{11}{6}\)
tính : a) 2/3 *( 2/18+6/12-3/33 ) b) 6/14+4/25-5/10*3/16 c)5/25*(9/18+16/32-12/46) + 9/17 d)11/32:(14/18-16/27) + (2/3-5/15) e) ( 1/9+2/17)+3/6-(12/17-1/2) +5/9
BÀI 1 : TÍNH NHANH
A) (1/9 - 9/17 ) + 3/6 - (12/17 - 1/2 ) + 5/9
B) 7/32 × ( -9/12 - 16/30 ) - ( 7/32 - 15 )
C) 3/10 × ( -5/9 + 3/5 ) - 3/10 × ( 3/9 + -2/5 )
D) -2/5 × ( 5/17 - 9/15 ) - 2/5 × ( 2/17 + -2/5 )
E) [ -5/13 - ( 3/5 +3/13 - 4/10 ) ] ÷ -15/11
G) 2/19 × ( -9/27 × 54/63 ÷ 5/7 )
MỌI NGƯỜI GIÚP MÌNH VỚI CHIỀU MÌNH PHẢI NỘP BÀI RỒI !
umk
Cách làm
1 là ko bít
2 là bí
3 là ế
BÀI 1 : TÍNH NHANH
A) (1/9 - 9/17 ) + 3/6 - (12/17 - 1/2 ) + 5/9
B) 7/32 × ( -9/12 - 16/30 ) - ( 7/32 - 15 )
C) 3/10 × ( -5/9 + 3/5 ) - 3/10 × ( 3/9 + -2/5 )
D) -2/5 × ( 5/17 - 9/15 ) - 2/5 × ( 2/17 + -2/5 )
E) [ -5/13 - ( 3/5 +3/13 - 4/10 ) ] ÷ -15/11
G) 2/19 × ( -9/27 × 54/63 ÷ 5/7 )
MỌI NGƯỜI GIÚP MÌNH VỚI CHIỀU MÌNH PHẢI NỘP BÀI RỒI