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(4.8×7.5×8.1)÷(2.4×2.5×2.7)简便计算

(4.8×7.5×8.1)÷(2.4×2.5×2.7) =(4.8÷2.4)x(7.5÷2.5)x(8.1÷2.7) =2x3x3 =18

①6.9×3.6-4.84÷0.4,=24.84-12.1,=12.74;②4.75+8.4÷(9.2-6.8),=4.75+8.4÷2.4,=4.75+3.5,=8.25;③1.2÷[2.5×(4.3-2.7)],=1.2÷[2.5×1.6],=1.2÷4,=0.3;④4.5×(0.75-0.356)+9.23,=4.5×0.394+9.23,=1.773+9.23,=11.003;⑤0.88÷0.8+3....

(1)4.05÷0.5+10.75=8.1+10.75=18.85(2)21.6÷0.8-1.2×5=27-6=21(3)6.8×2.7+2.7×3.2=(6.8+3.2)×2.7=10×2.7=27(4)8.4×6.9÷(6.44-4.14)=8.4×6.9÷2.3=8.4×(6.9÷2.3)=8.4×3=25.2(5)0.38×102 =0.38×(100+2)=0.38×100+0.38×2 =38+0.76...

(1/4+2/9)×3.6 =0.9+0.8 =1.7

(1)4.5×5.2+4.5×4.8=4.5×(5.2+4.8)=4.5×10=45;(2)8.8×1.25=(8+0.8)×1.25=8×1.25+0.8×1.25=10+1=11;(3)0.4×(4.3×2.5)=4.3×(0.4×2.5)=4.3×1=4.3;(4)60.8-1.75-1.25=60.8-(1.75+1.25)=60.8-3=57.8;(5)0.4×(4.3×2.5)=4.3×...

5/8 - 1/4 * (8/9 / 2/3) = 5/8 - 1/4 * 8/9 / 2/3 = 5/8 - 1/4 * 8/9 * 3/2 = 5/8 - (1/4 * 8/9) * 3/2 = 5/8 - (2/9 * 3/2) = 5/8 - 1/3 = 15/24 - 8/24 = 7/24

原式 =(3.9÷1.3)×(1.6÷0.8)×(2.7÷0.9) =3×2×3 =18

4.8×8-120%÷1.5 =4.8×8-1.2×2/3 =4.8×8-0.8 =4.8×8-8×0.1 =(4.8-0.1)×8 =4.7×8 =(5-0.3)×8 =40-2.4 =37.6

(1)12.74- 1 8 +2.26-9.875,=12.74-0.125+2.26-9.875,=(12.74+2.26)-(0.125+9.875),=15-10,=5;(2)4.8×3.9+6.1×4 4 5 ,=4.8×3.9+6.1×4.8,=4.8×(3.9+6.1),=4.8×10,=48;(3)(2.5-3.2× 5 16 )÷(4 8 15 ÷3.4),=(2.5-1)÷...

2.4*0.19+0.24*8.1 =2.4*0.19+2.4*0.81 =2.4*(0.19+0.81) =2.4*1 =2.4 注:相当于乘法时,前后两项同时乘以10,同时除以10;即前一项小数点后移一位,后一项小数点前移一位,大小不变

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