tinh bang cach thuan tien
1.25 - 6.75 + 6.75 + 11 x 65 -1.25+33 x 5
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\(\text{6.75.1.25-0.675.120-6.75.13}\)
\(=5400\)
Bạn nhé !!! k với nha !!!
a. 20,13 x 84,5 x 20,13
= 20,13 x 84,5 x 20,13 x 1
= 20,13 x ( 84,5 + 1 )
= 20,13 x 85,55
b. 4,5 x 11/5 + 5,5 x 11/5
= ( 4,5 + 5,5 ) x 11/5
= 10 x 11/5
= 22
a]20,13 * 84,5 * 20,13 = 20,13 * 2 * 84,5
= 20,13 * 169
= 3401,97
b] 4,5 * 11/5 + 5,5 * 11/5 = 11/5 * [4,5 + 5,5]
= 2,2 * 10
= 22
a/ = 7,8 x ( 34,5 + 15,5 ) = ..... tự tính
b/ 11/5 x (3/7 +4/7 )= .......tự tính
mk nhé
a, 7,8 x 34,5 +15,5 x 7,8 = 7,8 x ( 34,5 + 15,5) =7,8 x 50 =390
b, 3/7 x 11/5 +4/7 x 11/5 = 11/5 x ( 3/7 +4/7) = 11/5 x1=11/5
=.= hok tốt!!
2x25x50xx8=(25x8)x(50x2)=200x100=20000
12x11+21x11+11x33=11x(12+21+33)=11x66=726
2*25*50*8
=(2*50)*(25*8)
=100*200=20000
12*11+21*11+11*33
=11*(12+21+33)
=11*66=676
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
\(\frac{20}{11}X\)\(\frac{33}{23}X\)\(\frac{69}{180}\)\(=\frac{20X11X3X23X3}{11X23X20X3X3}=\)\(1\)
TỚI CHỖ \(\frac{20X11X3X23X3}{11X23X20X3X3}\)THÌ BẠN GẠCH CHÉO NHỮNG SỐ GIỐNG NHAU NHA
a)\(\frac{20}{11}.\frac{33}{23}.\frac{69}{180}=\frac{9}{9}=1\)
b: (675,98 + 888,66 + 111,34) x 0,01
= (675,98 + [888,66 + 111,34]) x 0,01
= (675,98 + 1000) x 0,01
= 1675,98 x 0,01
= 16,7598
(675,98 + 888,66 + 111,34) x 0,01
= (675,98 + [888,66 + 111,34]) x 0,01
= (675,98 + 1000) x 0,01
= 1675,98 x 0,01
= 16,7598
\(\frac{4}{15}+\frac{8}{13}+\frac{11}{15}+\frac{5}{13}\)
\(=\left(\frac{4}{15}+\frac{11}{15}\right)+\left(\frac{8}{13}+\frac{5}{13}\right)\)
\(=\frac{15}{15}+\frac{13}{13}\)
\(=1+1\)
\(=2\)
Chúc bạn học tốt nha !!!
\(\frac{4}{15}+\frac{8}{13}+\frac{11}{15}+\frac{5}{13}\)
\(=\left(\frac{4}{15}+\frac{11}{15}\right)+\left(\frac{8}{13}+\frac{5}{13}\right)\)
\(=1+1\)
\(=2\)
=(1.25-1.25)-(6.75-6.75)+11x65+11x3x5
=0-0+11x(65-15)
=11x50
=550
1.25 - 6.75 + 6.75 + 11 x 65 -1.25+33 x 5
=(1.25-1.25)+(6.75-6.75)+11.65+11.3.5
=0+0+11.65+11.(3.5)
=11.65+11.15
=11.(65+15)
=11.80
=880