用简便方法计算. 25×29×4 720-238-162 612+(465+388) 6000÷125÷8 169×28+131×28 48
用简便方法计算.25×29×4720-238-162612+(465+388)6000÷125÷8169×28+131×2848×125....
用简便方法计算. 25×29×4 720-238-162 612+(465+388) 6000÷125÷8 169×28+131×28 48×125.
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(1)25×29×4, =(25×4)×29, =100×29, =2900; (2)720-238-162, =720-(238+162), =720-400, =320; (3)612+(465+388), =612+465+388, =(612+388)+465, =1000+465, =1465; (4)6000÷125÷8, =6000÷(125×8), =6000÷1000, =6; (5)169×28+131×28, =(169+131)×28, =300×28, =8400; (6)48×125, =6×8×125, =6×(8×125), =6×1000, =6000. |
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