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a) \(134\times4\times5\)
\(=134\times\left(4\times5\right)\)
\(=134\times20\)
\(=2680\)
b) \(5\times36\times2\)
\(=\left(5\times2\right)\times36\)
\(=10\times36\)
\(=360\)
c) \(42\times2\times7\times5\)
\(=42\times7\times\left(2\times5\right)\)
\(=42\times7\times10\)
\(=42\times(7\times10)\)
\(=42\times70\)
\(=2940\)
a) 142 x 12 + 42 x 18 = 142 x (12 +18) = 142 x 30 = 4260
b) 49 x 365 – 39 x 365 = (49-39) x 365 = 10 x 365 = 3650
c) 4 x 18 x 25 = 18 x (4 x 25) = 10 x 100 = 1800
_k me_
@Min_ngu_ngục
_copy is not fun_
Tính bằng cách thuận tiện nhất :
a) 146 x 12 + 142 x 18
b) 49 x 365 - 39 x 365
c) 4 x 18 x 25
Bài giải
a) 142 x 12 + 142 x 18 = 142 x (12 + 18) = 142 x 30 = 4260
b) 49 x 365 – 39 x 365 = (49 – 39) x 365 = 10 x 365 = 3650
c) 4 x 18 x 25 = (4 x 25) x 18 = 100 x 18 = 1800
Chúc bạn học tốt nha!
1.
\(\frac{5}{3}-\frac{1}{4}+\frac{1}{3}-\frac{3}{4}\)
\(=\left(\frac{5}{3}+\frac{1}{3}\right)-\left(\frac{1}{4}+\frac{3}{4}\right)\)
\(=2-1=1\)
\(\frac{2}{7}\cdot\frac{1}{5}+\frac{2}{7}\cdot\frac{4}{5}=\frac{2}{7}\cdot\left(\frac{1}{5}+\frac{4}{5}\right)=\frac{2}{7}\cdot1=\frac{2}{7}\)
#Louis
\(1.a)\frac{5}{3}-\frac{1}{4}+\frac{1}{3}-\frac{3}{4}\)
\(=\left(\frac{5}{3}+\frac{1}{3}\right)-\left(\frac{1}{4}+\frac{3}{4}\right)\)
\(=2-1\)
\(=1\)
\(b)\frac{2}{7}\times\frac{1}{5}+\frac{2}{7}\times\frac{4}{5}\)
\(=\frac{2}{7}\times\left(\frac{1}{5}+\frac{4}{5}\right)\)
\(=\frac{2}{7}\times1\)
\(=\frac{2}{7}\)
\(2.a)\frac{5}{6}+\frac{7}{12}-\frac{2}{9}\)
\(=\frac{30}{36}+\frac{21}{36}-\frac{8}{36}\)
\(=\frac{43}{36}\)
\(b)\frac{4}{9}\times\frac{5}{8}+\frac{1}{6}\)
\(=\frac{5}{18}+\frac{1}{6}=\frac{5}{18}+\frac{3}{18}\)
\(=\frac{8}{18}=\frac{4}{9}\)
\(c)2:\frac{3}{11}-\frac{13}{12}\)
\(=2\times\frac{11}{3}-\frac{13}{12}\)
\(=\frac{22}{3}-\frac{13}{12}\)
\(=\frac{25}{4}\)
= (4 x 25) x 113 - (5 x 20) x 112
= 100 x 113 - 100 x 112
= 100 x (113 - 112)
= 100 x 1
= 100
4×113×25-5×112×20
=(4×25)×113-(5×20)×112)
=100×113-100×112
=100×(113-112)
=100×1
=100
theo mình nghĩ là
( 112 x 115 ) x ( 113 x 114 ) x 116
sai thì cho xin lỗi nha bn
2/3 : 1/2 + 1/3 : 1/2
= 4/3 + 2/3
= 2
3/5 : 4/7 : 7/6
= 21/20 : 7/6
= 9/10
4/9 x 7/5 : 7/9
= 28/45 : 7/9
= 4/5
Em nhớ k anh nha
có thể tính nốt phép tính 3/4 x 3/2 + 3/4 x 1/2 có đc ko ạ
(995 x 37 + 1000) : (39 x 995 - 990)
= (36815 + 1000) : (38805 - 990)
= 37815 : 37815
= 1
(995 x 37 + 1000 ) : ( 39 x 995 - 990)
= ( 36815 + 1000) : ( 38805 - 990 )
= 37815 : 37815
=1
a, \(\frac{5}{11}\times\frac{7}{25}+\frac{15}{11}\times\frac{1}{5}\)
\(=\frac{5}{11}\times\frac{7}{25}+\frac{5}{11}\times\frac{3}{5}\)
\(=\frac{5}{11}\times\left(\frac{7}{25}+\frac{3}{5}\right)\)
\(=\frac{5}{11}\times\frac{22}{25}\)
\(=\frac{2}{5}\)
b, \(\frac{3}{7}\times\frac{25}{19}-\frac{1}{7}\times\frac{18}{19}\)
\(=\frac{1}{7}\times\frac{75}{19}-\frac{1}{7}\times\frac{18}{19}\)
\(=\frac{1}{7}\times\left(\frac{75}{19}-\frac{18}{19}\right)\)
\(=\frac{1}{7}\times3\)
\(=\frac{3}{7}\)