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25x14x4
=(25x4)x14
=100x14
=1400
15x19:5
=(15:5)x19
=3x19
=57
31x2x8x5
=(31x8)x(2x5)
=248x10
=2480
25 × 14 × 4 = (25 × 4 ) × 14
=100 × 14
= 1 400
15 × 19 : 5 = ( 15 : 5 ) × 19
= 3 × 19
= 57
31 × 2 × 8 × 5 = (31 × 8 ) × ( 2 × 5 )
= 248 × 10
= 2 480
Trả lời
\(\frac{1}{2}:\frac{3}{4}+\frac{1}{6}:\frac{3}{4}\)
\(=\frac{1}{2}.\frac{4}{3}+\frac{1}{6}.\frac{4}{3}\)
\(=\frac{4}{3}.\left(\frac{1}{2}+\frac{1}{6}\right)\)
\(=\frac{4}{3}.\frac{2}{3}\)
\(=\frac{8}{9}\)
Bạn ơi cho mình hỏi là tại sao lại có \(\frac{4}{3}\)ạ
\(\frac{8}{14}+\frac{5}{12}+\frac{6}{14}+\frac{8}{12}-\frac{1}{12}\)
\(=\left(\frac{8}{14}+\frac{6}{14}\right)+\left(\frac{5}{12}+\frac{8}{12}-\frac{1}{12}\right)\)
\(=1+1=2\)
\(\frac{8}{14}+\frac{5}{12}+\frac{6}{14}+\frac{8}{12}-\frac{1}{12}\)
\(=\left(\frac{8}{14}+\frac{6}{14}\right)+\left(\frac{5}{12}+\frac{8}{12}-\frac{1}{12}\right)\)
\(=1+1=2\)
~ Hok tốt ~
\(67\times136+33\times136=136\times\left(67+33\right)=136\times100=13600\)
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20
=(1+19)+(2+18)+(3+17)+(4+16)+(5+15)+(6+14)+(7+13)+(8+12)+(9+11)+20+10
=20+20+20+20+20+20+20+20+20+20+10
=20×10+10
=200+10
=210
= ( 1 + 19 ) + ( 2 + 18 ) + ( 3 + 17 ) + (4 + 16 ) + ( 5 + 15 ) + ( 6 + 14 ) + ( 7 + 13 ) + ( 8 + 12) + ( 9+ 11 ) + 20
= 20 + 20 + 20 +20 + 20 +20 + 20 + 20 + 20 +20
= 20 x 10
= 200
tui đầu tiên đó
\(\frac{8}{14}+\frac{5}{12}+\frac{6}{14}+\frac{8}{12}-\frac{1}{12}\)
\(=\left(\frac{8}{14}+\frac{6}{14}\right)+\left(\frac{5}{12}+\frac{8}{12}-\frac{1}{12}\right)\)
\(=1+1\)
\(=2\)
\(\frac{8}{14}+\frac{5}{12}+\frac{6}{14}+\frac{8}{12}-\frac{1}{12}\)
\(=\)\(\left(\frac{8}{14}+\frac{6}{14}\right)+\left(\frac{5}{12}+\frac{8}{12}-\frac{1}{12}\right)\)
\(=\)\(1+1\)
\(=\)\(2\)
( 8/14 + 6/14 ) + ( 5/12 - 1/12 + 8/12 )
= 1 + ( 4/12 + 8/12 )
= 1 + 1 = 2
25 x 14 x 4
= ( 25 x 4 ) x 14
= 100 x 14
= 1400
15 x 19 : 5
= ( 15 : 5 ) x 19
= 3 x 19
= 57
31 x 2 x 8 x 5
= ( 31 x 8 ) x ( 5 x 2 )
= 248 x 10
= 2480
104 x ( 14 + 6 )
= 104 x 20
= 2080
67 x 136 + 33 x 136
= ( 67 + 33 ) x 136
= 100 x 136
= 13600
51 x 115 - 115 x 41
= ( 51 - 41 ) x 115
= 10 x 115
= 1150
Hok tốt
\(25\cdot14\cdot4=25\cdot4\cdot14=100\cdot14=1400\)
\(31\cdot2\cdot8\cdot5=31\cdot8\cdot2\cdot5=248\cdot10=2480\)
\(67\cdot136+33\cdot136=136\cdot\left(67+33\right)=136\cdot100=13600\)
\(51\cdot115-115\cdot41=115\cdot\left(51-41\right)=115\cdot100=11500\)
#Louis