四年级下册数学【运算定律】简便运算题
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简介
1.283+52+117+148 =(283+117)+(52+48) =400+100 =500 (运用加法交换律和结合律) 2.195-(95+24) =195-95-24 =100-24 =76 (运用减法性质) 3.(0.75+125)×8 =0.75×8+125×8 =6+1000 =1006 (运用乘法分配律) 4.(125-0.25)×8 =125×8-0.25×8 =1000-2 =998 (运用乘法分配律) 5.(1.125-0.75)÷0.25 =1.125÷0.25-0.75÷0.25 =4.5-3 =1.5 (运用除法性质) 6.(450+81)÷9 =450÷9+81÷9 =50+9 =59 (运用除法性质,相当乘法分配律) 7.375÷(125÷0.5) =375÷125×0.5 =3×0.5 =1.5 (运用除法性质) 8.4.2÷(0.6×0.35) =4.2÷0.6÷0.35 =7÷0.35 =20 (运用除法性质) 9.12×125×0.25×8 =(125×8)×(12×0.25) =1000×3 =3000 (运用乘法交换律和结合律) 10.(48×25×3)÷8 =48÷8×25×3 =6×25×3 =450 (运用除法性质,相当加法性质)
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