1/4+7/12-6/13-7/8
=5/6-6/13-7/8
=29/78-7/8
=-314/624
nếu đúng mink sin cái theo dõi nhé bạn
1/4+7/12-6/13-7/8
=5/6-6/13-7/8
=29/78-7/8
=-314/624
nếu đúng mink sin cái theo dõi nhé bạn
Bài 1: Tính nhanh
\(A=\dfrac{1}{4}.\dfrac{7}{3}.12\)
\(B=\dfrac{3}{8}.56.\dfrac{25}{7}.\left(-4\right)\)
\(C=\dfrac{6}{7}.\dfrac{8}{13}+\dfrac{6}{13}.\dfrac{9}{7}-\dfrac{3}{13}.\dfrac{6}{7}\)
\(D=\dfrac{-1}{4}.\dfrac{152}{11}+\dfrac{68}{4}.\dfrac{-1}{11}\)
BT2: Tính nhanh
1) \(\dfrac{5}{6}-\dfrac{6}{7}+\dfrac{7}{8}-\dfrac{8}{9}+\dfrac{10}{9}-\dfrac{5}{6}+\dfrac{6}{7}-\dfrac{7}{8}+\dfrac{8}{9}\)
2) \(\dfrac{1}{13}+\dfrac{16}{7}+\dfrac{3}{105}-\dfrac{9}{7}-\dfrac{-12}{13}\)
Tìm x thuộc Z:
1) -5x - (-3) = 13
2) 15 - ( x - 7) = -21
3) 45 - ( x - 9) = -35
4) | x - 2 | = 3
5) | x - 3| - 7 = 13
6) 72 - 3 . | x + 1 | = 9
7) 17 - ( 43 - | x | ) = 45
8) 3| x - 1| - 5 = 7
9) -12( x - 5) + 7( 3 -x) = 5
10) (x - 2) . ( x + 4 ) = 0
Tìm x
A, | x - 3/2 | = (12/13 + 7 ) + ( - 8 + 1/13 )
B, ( 3/4 - 1/5 - 1/6 ) × 1/30 - | 3 × x - 3 | = 2
C, 2147/452 < x3/4 < 2835/420 ( x là phần nguyên của hỗn số )
Tìm x
A, | x - 3/2 | = ( 12/13 + 7 ) + ( -8 + 1/13)
B, ( 3/4 - 1/5 - 1/6 ) × 1/30 - | 3 × x - 3 | = 2
C, 2147/452 < x3/4 < 2835/420 ( x là phần nguyên của hỗn số )
Tính hợp lý:
1) 35 x 18 - 5 x 7 x 18
2) 45 - 5 x ( 12 + 9)
3) 24 x ( 16 - 5) - 16 x ( 24 - 5)
4) 29 x ( 19 - 13) - 19 x ( 29 - 13 )
5) 31 x (-18) + 31 x (-81) - 31
6) (-12) x 47 + (-12) x 52 + (-12)
7) 13 x ( 23 + 22 ) - 3 x ( 17 + 28 )
8) -48 + 48 x (-78) + 48 x (-21)
Thực hiện phép tính( hợp lí nếu có thể)
\(\dfrac{1}{2}+\dfrac{3}{4}-\left(\dfrac{3}{4}-\dfrac{4}{5}\right)\)
\(\dfrac{-3}{7}+\dfrac{3}{4}:\dfrac{3}{14}\)
\(5-\dfrac{7}{39}:\dfrac{7}{13}+\dfrac{8}{9}:4\)
\(1\dfrac{13}{15}.0,75-\left(\dfrac{11}{20}+25\%\right):\dfrac{7}{3}\)
\(\left(\dfrac{5}{12}:\dfrac{11}{6}+\dfrac{5}{12}:\dfrac{11}{5}\right)--\dfrac{7}{12}\)
làm nhanh cho mình nha!!!!Thank nhìu
BT1: Tính nhanh:
6) 81. \(\dfrac{12-\dfrac{12}{7}-\dfrac{12}{289}-\dfrac{12}{85}}{4-\dfrac{4}{7}-\dfrac{4}{289}-\dfrac{4}{85}}\) : \(\dfrac{5+\dfrac{5}{13}+\dfrac{5}{169}+\dfrac{5}{91}}{6+\dfrac{6}{13}+\dfrac{6}{169}+\dfrac{6}{91}}\). \(\dfrac{158158158}{711711711}\)
Tinh gia tri cua cac bieu thuc sau theo 1 cach hop li
a, A= 1/3 × -6/13 × -9/10 × -13/36
b, B= -1/3 × -15/17 × 34/45
c, C=1/3 × 4/5 + 1/3 × 6/5 + 2/3
d, D= -5/6 × 4/19 + -7/12 × 4/19 - 40/57
e, E= 3/7 × 9/26 - 1/14 × 1/13 - 1/7