15 + 15x2 +15x7 -100
= 15 x( 1+2+7) -100
= 15 x 10 -100
= 150 -100 = 50
15+15x2+15x7-100
=15x(1+2+7)-100
=15x10-100
=150-100
=50
15+15x2+15x7-100=15+30+105-100=45+105-100=150-100=50
15 + 15 x 2 + 15 x 7 - 100
= 15 x ( 1 + 2 + 7 ) - 100
= 15 x 10 - 100
= 150 - 100
= 50
15+15x2+15x7-100
= 15x1+15x2+15x7-100
= 15x(1+2+7)-100
= 15x10-100
= 150-100
= 50