Question

小学数学五年级简便计算

简便计算：
（1）3.4×7.8÷3.9
（2）85÷0.17÷5
（3）0.125×（2.4+0.8）×2.5
（4）9.9×9.9
（5）17.3×9.9+1.73
（6）8.5×96+34
（7）1.1+2.1+3.1+4.1+5.1
（8）99.9×999+99.9×2
（9）（4.5×7.5×4.8）÷（1.5×2.5×2.4）
（10）3÷4×66+3÷4×34
要写出过程！答得好的加悬赏！注意是简便计算！！！

Answer 1

(1)( 7.8/3.9)*3.4=2*3.4=6.8
(2) (85/5)/0.17=17/0.17=0.01
(3) (0.125*2.4+0.125*0.8)*2.5= (0.3+0.1)*2.5=0.4*2.5=1
(4) (10-0.1)*9.9=10*9.9-0.1*9.9=99-0.99=98.01
(5) 17.3*(10-0.1)+1.73=10*17.3-17.3*0.1+1.73=173
(6) 8.5*(100-4)+34=100*8.5-8.5*4+34=850
(7) (1+0.1)+(2+0.1)+(3+0.1)+(4+0.1)+(5+0.1)=(1+2+3+4+5)+5*0.1=15.5
(8) 99.9*(999+1+1)=99.9*(1000+1)=99.9*1000+99.9=99900+99.9=99999.9
(9)(3*1.5*3*2.5*2*2.4)/(1.5*2.5*2.4)=3*3*2=18
(10)(3/4)*(66+34)=(3/4)*100=75
*乘 /除

Answer 2

1. =3.4×(7.8÷3.9 )=3.4×2=6.8
2. =85÷5÷0.17=17÷0.17=100
3. =0.125×8×（0.3+0.1)×2.5=1×0.4×2.5=1
4. =(10-0.1)×(10-0.1)=100-2+0.01=98.01
5. =17.3×(9.9+0.1)=17.3×10=173
6. =8.5×96+8.5×4=8.5×100=850
7. =1+2+3+4+5+0.1×5=15.5
8. =99.9×1000+99.9×1=99999.9
9. =(4.5÷1.5)*(7.5÷2.5)*(4.8÷2.4)=3*3*2=12
10. =3÷4*(66+34)=3÷4*100=3*(100÷4)=3*25=75

Answer 3

五年级上册简便计算

Answer 4

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