Question

A) 21 + 8:2 = b) 3.5 - 8 =c) 143:11 + 7 =d) 13.5 - 47 =e) 99 · 11 – 7.41 =g) 315:3.4 + 12 =h) 512 - 129 - 8:3 =f) 34 : 2 + 7 · 14 =i) 19.5 + 72:3.5 =j) 4.17 - 21 - 4:7-7.6 =​

Answer 1

а)21+8:2=21+4=25

б)3,5-8=-(8-3,5)=-5,5

3)143:11+7=13+7=20

4)13,5-47=-(47-13,5)=-33,5

5)99×11-7,41=1089-7,41=1,081.59

6)315:3,4+12=92.6470588+12=104.647059

7)512-129-8÷3=512-129-2.66666667=380.333334

8)34:2+7×14=17+98=115

9)19,5+72:3,5=19,5+20.5714286=40.0714286

10),4,17-21-4:7-7,6 = 4,17-21-0.571428571-7,6=-25

Answer 2

Ответ:

a) 21 + 8:2 = 25

b) 3.5 - 8 = 4.5

c) 143:11 + 7 = 20

d) 13.5 - 47 =  33.5

e) 99 · 11 – 7.41 =  1081,59

g) 315:3.4 + 12 =  1779/17

h) 512 - 129 - 8:3 = 1141/3

f) 34 : 2 + 7 · 14 = 115

i) 19.5 + 72:3.5 = 561/14

j) 4.17 - 21 - 4:7-7.6 =​17501/700

Answer 3

Let's solve the given mathematical expressions:

a) 21 + 8 ÷ 2 = 21 + 4 = 25 b) 3.5 - 8 = -4.5 c) 143 ÷ 11 + 7 = 13 + 7 = 20 d) 13.5 - 47 = -33.5 e) 99 × 11 - 7.41 = 1089 - 7.41 = 1081.59 g) 315 ÷ 3.4 + 12 = 92.647 + 12 = 104.647 h) 512 - 129 - 8 ÷ 3 = 512 - 129 - (8 ÷ 3) = 512 - 129 - 2.67 = 380.33 f) 34 ÷ 2 + 7 × 14 = 17 + 98 = 115 i) 19.5 + 72 ÷ 3.5 = 19.5 + 20.571 = 40.071 j) 4.17 - 21 - 4 ÷ 7 - 7.6 = 4.17 - 21 - 0.57 - 7.6 = -25 - 8.17 = -33.17

Therefore, the solutions to the given expressions are: a) 25 b) -4.5 c) 20 d) -33.5 e) 1081.59 g) 104.647 h) 380.33 f) 115 i) 40.071 j) -33.17