简便计算 99+101+297+3 125×32×25 156×l0l-156 99×67 5620-562-438 1300÷25÷4
简便计算99+101+297+3125×32×25156×l0l-15699×675620-562-4381300÷25÷4....
简便计算 99+101+297+3 125×32×25 156×l0l-156 99×67 5620-562-438 1300÷25÷4.
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(1)99+101+297+3, =(99+101)+(297+3), =200+300, =500; (2)125×32×25, =125×(4×8)×25, =(125×8)×(25×4), =1000×100, =100000; (3)156×l0l-156, =156×(l0l-1), =156×100, =15600; (4)99×67, =(100-1)×67, =100×67-1×67, =6700-67, =6633; (5)5620-562-438, =5620-(562+438), =5620-1000, =4620; (6)1300÷25÷4, =1300÷(25×4), =1300÷100, =13. |
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