计算,能用简便方法计算的要写出简算的主要过程.5.24+7.9+4.76 25×37×4 5.12-1.47-2.53 56×125 96.2+
计算,能用简便方法计算的要写出简算的主要过程.5.24+7.9+4.7625×37×45.12-1.47-2.5356×12596.2+78-6.2450÷5÷952×2...
计算,能用简便方法计算的要写出简算的主要过程.5.24+7.9+4.76 25×37×4 5.12-1.47-2.53 56×125 96.2+78-6.2 450÷5÷9 52×23+48×23 510-240÷12×15 156×101-156 (2400-80×20)÷20 4.5+3.15-4.5+3.15.
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(1)5.24+7.9+4.76 =5.24+4.76+7.9 =10+7.9 =17.9; (2)25×37×4 =25×4×37 =100×37 =3700; (3)5.12-1.47-2.53 =5.12-(1.47+2.53) =5.12-4 =1.12; (4)56×125 =7×(8×125) =7×1000 =7000; (5)96.2+78-6.2 =96.2-6.2+78 =90+78 =168; (6)450÷5÷9 =450÷(5×9) =450÷45 =10; (7)52×23+48×23 =(52+48)×23 =100×23 =2300; (8)510-240÷12×15 =510-20×15 =510-300 =210; (9)156×101-156 =156×(101-1) =156×100 =15600; (10)(2400-80×20)÷20 =(2400-1600)÷20 =800÷20 =40; (11)4.5+3.15-4.5+3.15 =4.5-4.5+(3.15+3.15) =0+6.3 =6.3. |
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