1 tinh
1 5/7*3\4 10\11:1 1\3
3.57*4.1+2.43*4.1 3.42:0.57*8.4-6.8
2 tinh bang cach thuat tien nhat
21/11*22/17*68/63 5/14*7/13*26/25
1 5/7 *3/4 10/11:1 1/3 3.57*4.1+2.43*4.1 3.42:0.57*8.4-6.8
\(1\frac{5}{7}\cdot\frac{3}{4}=\frac{12}{7}\cdot\frac{3}{4}=\frac{9}{7}\)
\(\frac{10}{11}:1\frac{1}{3}=\frac{10}{11}:\frac{4}{3}=\frac{15}{22}\)
\(3,57\cdot4,1+2,43\cdot4,1=(3,57+2,43)\cdot4,1\)
\(=6\cdot4,1=24,6\)
Cuối tự làm
~Chúc bn học tốt~
\(1\frac{5}{7}x\frac{3}{4}=\frac{12}{7}x\frac{3}{4}=\frac{9}{7}\)
\(\frac{10}{11}:1\frac{1}{3}=\frac{10}{11}:\frac{4}{3}=\frac{10}{11}x\frac{3}{4}=\frac{30}{44}=\frac{15}{22}\)
\(3,57x4,1+2,43x4,1=4,1x\left(3,57+2,43\right)=4,1x6=24,6\)
\(3,42:0,57x8,4-6,8=6x8,4-6,8=50,4-6,8=43,6\)
minh cam on 2 ban nhiu nha co j ket ban voi minh nha
3.42:0.57*8.4-6.8
3,42 : 0,57 x 8,4 - 6,8
=6 x 8,4 - 6,8
=50,4 - 6,8
43,6
k mik với
\(3,42:0,57\times8,4-6,8\)
\(=3,42\times\frac{100}{57}\times8,4-6,8\)
\(=6\times8,4-6,8\)
\(=50,4-6,8\)
\(=43,6\)
Tính:
a) A=( 3/7+ -2/5 ) : 9/11 + (4/7 + -3/5) : 9/11
b) B=(-4)2. (3/4 - 0,25) + ( 4.1/2 - hỗn số 1 1/2)
tinh nhanh
1/2.1/-3+1/-3.1/4+1/4.1/-5+1/-5.1/6
tinh nhanh:M=1/4.152/11+68/4.1/11
1/2.1/3+1/3.1/4+1/4.1/5+...+1/9.1/10
tinh bang cach thuan tien 3/5 x 7/9 + 11/9 x 3/5 - 3/10. B 14/13 : 1/2 + 3/13 x2 -2 x 7/13
a) 3/5x7/9+11/9x3/5
=3/5 x(7/9+11/9)
= 3/5x2
=6/5
b)14/13:1/2+3/13x2-2x7/13
= 14/13 x 2 +3/13 x2 - 2x7/13
=2 x (14/13 +3/13 -7/13)
= 2 x 10/13
= 20/13
a) 3/5 x 7/9 + 11/9 x 3/5 - 3/10
= 3/5 x 7/9 + 11/9 x 3/5 - 3/5 x 2
= 3/5 x ( 7/9 + 11/9 - 2 )
= 3/5 x 0
= 0
b) 14/13 : 1/2 + 3/13 x 2 - 2 x 7/13
= 14/13 x 2/1 + 3/13 x 2 - 2 x 7/13
= ( 14/13 + 3/13 - 7/13 ) x 2
= 10/13 x 2 = 20/13
chẳng hiể gì cả
A= 1/2.1/3+1/3.1/4+1/4.1/5+1/5.1/6+1/6.1/7+1/7.1/8+1/8.1/9
Tìm x
1.-9/46 - 4/1/23 : (3/1/4 - x : 3/5) + 2/8/23=1
2.(6/2/7 * x +3/7) : 2/1/5 - 3/7=-1
3.5/8/17 : x + (-1/17) : x + 3/1/17 : 17/1/3=4/17
4.1/1 * 4 + 1/4 * 7 + 1/7 * 10 + ...+ 1/x(x + 3)=6/19