问题
解答题
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答案
125×(3×8), =125×8×3, =1000×3, =3000; 25×(80+8), =25×80+25×8, =2000+200, =2200; 178×101, =178×100+178, =17978; | ||
99×38, =38×100-38, =3800-38, =3762; 78×99+78, =78×100, =7800; 125×37+63×125, =125×(37+63), =125×100, =12500; | ||
32×125, =8×125×4, =1000×4, =4000; 647×23-23×547, =(647-547)×23, =100×23, =2300; |
=1724-724+530,
=1000+530,
=1530.