e chiu thanh no

ds:37119062753711906275

a. 646 919

b. 673549

c. 173 404

d. 35 dư 3

a. 646 919

b. 673549

c. 173 404

d. 35 dư 3

a) 646919 

b) 673549

c) 173404

d) 147 (dư 31)

a: 12+18+24+36+42+48

=30+60+90

=90+90

=180

b: 327-16+216-27+500

=(327-27)+(216-16)+500

=300+200+500

=1000

c: \(385\cdot485+386\cdot515\)

\(=385\cdot485+385\cdot515+515\)

\(=385\cdot1000+515=385000+515=385515\)

d: \(16\cdot48+8\cdot48+16\cdot28\)

\(=16\cdot\left(48+28\right)+8\cdot2\cdot24\)

\(=16\cdot\left(76+24\right)=16\cdot100=1600\)

e: \(2\cdot4\cdot8\cdot50\cdot25\cdot125=4\cdot25\cdot8\cdot125\cdot2\cdot50\)

\(=100\cdot100\cdot1000=10000000\)

g: \(17\cdot8+51\cdot4=17\cdot4\cdot\left(2+3\right)=17\cdot4\cdot5=17\cdot20=340\)

\(1-\frac{385}{386}=\frac{1}{386}\)

\(1-\frac{578}{579}=\frac{1}{579}\)

Ta có: \(\frac{1}{386}>\frac{1}{579}\)

\(\Rightarrow1-\frac{578}{579}< 1-\frac{385}{386}\)

\(\Rightarrow-\frac{578}{579}< -\frac{385}{386}\)

Vậy \(-\frac{578}{579}< -\frac{385}{386}\)

a, 386 154 + 260 765

b, 726 485 – 52 936

c, 308 × 563

d, 5 176 : 35

a, -(515 - 80 - 91) - ( 485 + 80 - 91)
= (-515) + 80 + 91 - 485 - 80 + 91 (bỏ ngoặc)
= [(-515) - 485] + [80 + (-80)] + 91 + 91
= -1000 + 91 +91
= -818
b, (35 - 815) - (715 - 65) - (-20)
= 35 - 815 - 715 + 65 + 20
= (35 + 65) - (815 + 715) + 20
= 100 - 1530 + 20
= -1410