脱式计算,能简算的要简算.0.8×3.9×1.25 4.87×2.34+4.8
脱式计算,能简算的要简算.0.8×3.9×1.254.87×2.34+4.87×7.660.49×9.960.8-7.18-12.822.5×3.2×12.53.95×7...
脱式计算,能简算的要简算.0.8×3.9×1.25 4.87×2.34+4.87×7.66 0.49×9.9 60.8-7.18-12.82 2.5×3.2×12.5 3.95×7.6+2.4.
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(1)0.8×3.9×1.25 =0.8×1.25×3.9 =1×3.9 =3.9 (2)4.87×2.34+4.87×7.66 =4.87×(2.34+7.66) =4.87×10 =48.7 (3)0.49×9.9 =0.49×(10-0.1) =0.49×10-0.49×0.1 =4.9-0.049 =4.851 (4)60.8-7.18-12.82 =60.8-(7.18+12.82) =60.8-20 =40.8 (5)2.5×3.2×12.5 =2.5×(0.4×8)×12.5 =(2.5×0.4)×(8×12.5) =1×100 =100 (6)3.95×7.6+2.4 =30.02+2.4 =32.42. |
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