35 x 18 + 90 x 70 + 70
= 35 x 2 x 9 + 90 x 70 + 70 x 1
= 70 x 9 + 90 x 70 + 70 x 1
= 70 x ( 9 + 90 + 1 )
= 70 x 100
= 7000
35x18+90x70+70
=35x18+90x2x35+2x35
=35x18+180x35+2x35
=35x(18+180+2)
=35x200
=7000
35x2x9+90x70+70x1
=70x9+90x70+70x1
=70x(9+90+1)
=70x100
=7000
Bài làm:
35x18+90x70+70
=35x2x9+90x70+70x1
=70x9+90x70+70x1
=70x(9+90+1)
=70x100
=7000
học tốt
= 70 x 9 + 90 x 70 + 70 x 1
= 70 x ( 9 + 90 + 1 )
= 70 x 100
= 7000