数学简便计算题及答案五年级
2025-10-10
（1）2.5*32*0.125 =（2.5*4）*（8*0.125） =10*1 =10 （2）3.5-7+6.5 =3.5+6.5-7 =3 （3）1.2×2.5+0.8×2.5 =2.5(1.2+0.8) =25 （4）8.9×1.25-0.9×1.25 =1.25(8.9-0.9) =10 （5）12.5×7.4×0.8 =12.5×0.8×7.4 =74 （6）6.5×9.5+6.5×0...
2025-10-10
（1）2.5*32*0.125 =（2.5*4）*（8*0.125） =10*1 =10 （2）3.5-7+6.5 =3.5+6.5-7 =3 （3）1.2×2.5+0.8×2.5 =2.5(1.2+0.8) =25 （4）8.9×1.25-0.9×1.25 =1.25(8.9-0.9) =10 （5）12.5×7.4×0.8 =12.5×0.8×7.4 =74 （6）6.5×9.5+6.5×0...