=7x15 + 3x15 + 15x2 -30
=15x(7+3+2)-30
=15x12-30
=180-30
=50
Mình bằng ra luôn nha
= 7x15-15x2+3x15+15x2
=15x(7-2+3+2)
=15x10
=150
Kb vs Mik nha
7 x 15 - 30 + 3 x 15 + 15 x 2
= 7 x 15 - 15 x 2 + 3 x 15 + 15 x 2
= 15 x ( 7 - 2 + 3 + 2 )
= 15 x 10
= 150
7 x 15 - 30 + 3 x 15 + 15 x 2
= 15 x (7+3) - 30 + 15 x 2
= 15 x 10 - 30 + 30
=150
\(7\cdot15-30+3\cdot15+15\cdot2\)
=\(7\cdot15-30+3\cdot15+30\)
=\(7\cdot15+3\cdot15-30+30\)
=\(7\cdot15+3\cdot15\)
=\(15\cdot\left(7+3\right)=15\cdot10=150\)
Cách tính thuận tiện nhất là :
7 x 15 - 30 + 3 x 15 + 15 x 2
= 15 x ( 7 + 3 ) - 30 + 15 x 2
= 15 x 10 -30 + 30
= 150 - 0
= 150
...
Nguyễn Vũ Đoan Trang
7 x 15 - 30 + 3 x 15 + 15 x 2
= 7 x 15 - 30 + 3 x 15 + 30
= 7 x 15 + 3 x 15 - 30 + 30
= 7 x 15 + 3 x 15
= 15 x ( 7 + 3 )
= 15 x 10 = 150
15 x (7 + 3 + 2 ) - 30
=15 x 12 - 30
= 180 - 30
= 50
7 x 15 - 30 + 3 x 15 + 15 x 2
= 15 x ( 7 + 3 + 2 ) - 30
= 15 x 12 - 30
= 180 - 30
= 150
TK NHA
15.(7+3+2)-30
=15.12-30
=(15.10)+(15.2)-30
=150+30-30
=150+(30-30)
=150+0
=150