脱式计算,能简算的可以简算49×102-2×49 125×76×8 8.33-2.43-4.57 103×32 36×99+36 41000
脱式计算,能简算的可以简算49×102-2×49125×76×88.33-2.43-4.57103×3236×99+3641000÷8÷125(39+21)×(84÷7)...
脱式计算,能简算的可以简算49×102-2×49 125×76×8 8.33-2.43-4.57 103×32 36×99+36 41000÷8÷125 (39+21)×(84÷7) 550+230×62÷31 (324-285)×12÷26.
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(1)49×102-2×49 =49×(102-2) =49×100 =4900; (2)125×76×8 =125×8×76 =1000×76 =76000; (3)8.33-2.43-4.57 =8.33-(2.43+4.57) =8.33-7 =1.33; (4)103×32 =(100+3)×32 =100×32+3×32 =3200+96 =3296; (5)36×99+36 =36×(99+1) =36×100 =3600; (6)41000÷8÷125 =41000÷(8×125) =41000÷1000, =41; (7)(39+21)×(84÷7) =60×12 =720; (8)550+230×62÷31 =550+230×(62÷31) =550+230×2 =550+460 =1010; (9)(324-285)×12÷26 =39×12÷26 =468÷26 =18. |
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