98+265+202 273-73-27
=(98+202)+265 =273-(73+27)
=300+265 =273-100
=565 =173
250×13×4 3200÷4÷25
=(250×4)×13 =3200÷(4×25)
=1000×13 =3200÷100
=13000 =32
88×125 99×38+38
=11×(8×125) =(99+1)×38
=11×1000 =100×38
=11000 =3800
17×23-23×7 72×125
=(17-7)×23 =9×(8×125)
=10×23 =9×1000
=230 =9000