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15 x 5 x 3 x ( 18 x 32 - 8 x 32 - 10 x 32 )
= 15 x 5 x 3 x { 18 - 8 - 10 } x 32 }
= 15 x 5 x 3 x 0
= 0
Vì số nào nhân với 0 cx bằng 0
15 x 5 x 3 x ( 32 x (18-8-10)
15 x 5 x 3 x(32 x 0 )
15 x 5 x 3 0 = 0
h nha
= ( 2380 + 9 x 480) : 25 - 3500 : 25
= ( 2380 + 4320 - 3500 ) : 25
= 3200 : 25
= 128
a: \(=\dfrac{4}{3}\cdot\dfrac{32}{10}+\dfrac{8}{3}\cdot\dfrac{36}{10}-\dfrac{4}{10}\cdot\dfrac{12}{9}\)
\(=\dfrac{128}{30}+\dfrac{288}{30}-\dfrac{48}{90}=\dfrac{416}{30}-\dfrac{24}{30}=\dfrac{392}{30}=\dfrac{196}{15}\)
[1+3+...+13+15] x[16 x2+4x16-32x3] =[1+3+...+13+15] x 0 =0
( 1 + 3 + .... + 13 + 15 ) x ( 16 * 2 + 4 * 16 - 32 * 3 )
= ( 1+ 3 + ... + 13 + 15) x ( 16 * 2 + 4 * 16 - 16 * 2 * 3)
= ( 1 + 3 + ...+ 13 + 15) x { [ 16 * ( 2 + 4 - 2 * 3 ) ] }
= ( 1 + 3 + ... + 13 + 15 ) x 16 * 0
= ( 1 + 3 + .... +13 +15 ) x 0
=0
\(\left(25\times32\right)\div4\\ =25\times32\div4\\ =25\times\left(32\div4\right)\\ =25\times8\\ =200\)
`(25 \times 32) \div 4`
`= (25 \times 4 \times 8) \div 4`
`= (100 \times 8) \div 4`
`= 800 \div 4`
`= 200`
Bài làm
\(\frac{7}{15}x\frac{3}{8}+\frac{7}{15}x\frac{5}{8}\)
= \(\frac{7}{15}x\left(\frac{3}{8}+\frac{5}{8}\right)\)
= \(\frac{7}{15}x\frac{8}{8}\)
= \(\frac{7}{15}x1\)
= \(\frac{7}{15}\)
# Chúc bạn học tốt #
\(\frac{7}{15}\cdot\frac{3}{8}+\frac{7}{15}\cdot\frac{5}{8}\)
\(=\frac{7}{15}\cdot(\frac{3}{8}+\frac{5}{8})\)
\(=\frac{7}{15}\cdot1=\frac{7}{15}\)
1/4
\(=\dfrac{8}{15}\left(\dfrac{25}{32}-\dfrac{10}{32}\right)=\dfrac{8}{15}\cdot\dfrac{15}{32}=\dfrac{1}{4}\)
( 25/32 - 10/32) x 8/15
= 15/32 x 8/15
= 1/4
\(=\dfrac{8}{15}\times\left(\dfrac{25}{32}-\dfrac{10}{32}\right)=\dfrac{8}{15}\times\dfrac{15}{32}=\dfrac{1}{4}\)
\(\dfrac{1}{4}\)
1/4
= 8/15 x ( 25/32 - 10/32 )
= 8/15 x 15/32
= 1/4
\(=\dfrac{8}{15}\times\left(\dfrac{25}{32}-\dfrac{10}{32}\right)=\dfrac{8}{15}\times\dfrac{15}{32}=\dfrac{8}{32}=\dfrac{1}{4}\)
=8/15 x ( 25/32-10/32 )
=8/15 x 15/32
=1/4
= 8/15 x (25/32 - 10/32)
= 8/15 x 15/32
= 1/4
Ôi may quá!Đáp án mình sai nhưng kịp rút gọn thành đáp án đúng =))
=8/15x(25/32 - 10/32)=8/15 x 15/32=1/4
\(\dfrac{8}{15}\times\dfrac{25}{32}-\dfrac{8}{15}\times\dfrac{10}{32}\)
\(=\dfrac{8}{15}\times\left(\dfrac{25}{32}-\dfrac{10}{32}\right)\)
\(=\dfrac{8}{15}\times\dfrac{15}{32}=\dfrac{1}{4}\)
\(\dfrac{8}{15}\times\dfrac{25}{32}-\dfrac{8}{15}\times\dfrac{10}{32}=\dfrac{8}{15}\times\left(\dfrac{25}{32}-\dfrac{10}{32}\right)=\dfrac{8}{15}\times\left(\dfrac{25-10}{32}\right)=\dfrac{8}{15}\times\dfrac{15}{32}=\dfrac{8\times15}{15\times32}=\dfrac{120}{480}=\dfrac{1}{4}\)
\(\dfrac{8}{15}\)x\(\dfrac{25}{32}\)-\(\dfrac{8}{15}\)x\(\dfrac{10}{32}\)
= \(\dfrac{8}{15}\)x(\(\dfrac{25}{32}-\dfrac{10}{32}\))
= \(\dfrac{8}{15}\)x\(\dfrac{15}{32}\)
= \(\dfrac{1}{4}\)
` 8/15 . 25/32 - 8/15 . 10/32 = 8/15 ( 25/32 - 10/32 ) = 8/15 . 15/32=1/4 `