1、
(10+2)×95
=10×95+2×95
=950+190
=1140。
2、
=12×(100—5)
=1200—60
=1140。
12× 95
=(10+2)×95
=10×95+2×95
=950+190
=1140
12×95
=12×(100-5)
=12×100-12×5
=1200-60
=1140
12x95=12x100-12x5=1200-60=1140
12x95=10x95+2x95=950+190=1140
12x95=12x(100-5)=12x100-12x5=1200-60=1140
12x95=(10+2)x95=10x95+2x95=950+190=1140
12x95=(10+2)(100-5)=10x100+2x100-10x5-2x5=1140