s) 6450 + 6540 + 550 - 540
= ( 6450 + 550 ) + ( 6540 - 540 )
= 7000 + 6000
= 13000
b) 25 x 20 x 4 x 5 x 7
= ( 25 x 4 ) x ( 20 x 5 ) x 7
= 100 x 100 x 7
= 10000 x 7
= 70000
c) 44 + 44 x 16 + 44 x 2 - 44 x 9
= 44 x 1 + 44 x 16 + 44 x 2 - 44 x 9
= 44 x ( 1 + 16 + 2 - 9 )
= 44 x 10
= 440
a)
\(6450+6540+550-540\)
\(=\left(6450+550\right)+\left(6540-540\right)\)
\(=7000+6000\)
\(=13000\)
b)
\(25\times20\times4\times5\times7\)
\(=\left(25\times4\right)\times\left(20\times5\right)\times7\)
\(=100\times100\times7\)
\(=10000\times7\)
\(=70000\)
c)
\(44+44\times16+44\times2-44\times9\)
\(=44\times1+44\times16+44\times2-44\times9\)
\(=44\times\left(1+16+2-9\right)\)
\(=44\times10\)
\(=440\)
a)6450+6540+550-540
=(6450+550)+(6540-540)
=7000+6000
=13 000
b)25x20x4x5x7
=(25x4)x(20x5)x7
=80x100x7
=8000x7
=56 000
c)44+44x16+44x2-44x9
=44x(16+44+2+9)
=44+71
=115
6450 + 6540 + 550 - 540
= ( 6450 + 550 ) + ( 6540 - 540 )
= 7000 + 6000
= 13 000
25 x 20 x 4 x 5 x 7
= ( 25 x 4 ) x ( 20 x 5 ) x 7
= 100 x 100 x 7
= 10 000 x 7
= 70 000
44 + 44 x 16 + 44 x 2 - 44 x 9
= 44 x ( 1 + 16 + 2 - 9 )
= 44 x 10
= 440
a) \(6450+6540+550-540\)
\(=\left(6450+550\right)+\left(6540-540\right)\)
\(=7000+6000\)
\(=13000\)
các câu sau tương tự
Bài làm
a) 6450 + 6540 + 550 - 540
= ( 6450 + 550 ) + ( 6540 - 540 )
= 7000 + 6000
= 13000
b) 25 x 20 x 4 x 5 x 7
= ( 25 x 4 ) x ( 20 x 5 ) x 7
= 100 x 100 x 7
= 10000 x 7
= 70000
c) 44 + 44 x 16 + 44 x 2 - 44 x 9
= 44 x 1 + 44 x 16 + 44 x 2 - 44 x 9
= 44 x ( 1 + 16 + 2 - 9 )
= 44 x 10
= 440
P/s tham khảo nha
