Question

A) 100+(157-7×8)÷5;b) 200-(28+9×8)÷4;c) 1000-(162-6×7)÷8;d) 650+(133-7×9)÷7!​

Answer 1

Ответ:

Пошаговое объяснение:

a) 100+(157-7×8)÷5 = 100+(157 - 56):5 = 100 + 101:5 = 100 + 20,2 = 120,2

возможно, не 157, а 156, тогда:

100+(156-7×8)÷5 = 100+(156 - 56):5 = 100 + 100:5 = 100 + 20 = 120

b) 200-(28+9×8)÷4 = 200  - (28 + 72):4 = 200 - 100:4 = 200-25 = 175

c) 1000-(162-6×7)÷8 = 1000 - (162 - 42):8 = 1000 - 120:8 = 1000 - 15 = 985

d) 650+(133-7×9)÷7 = 650 + (133 - 63):7 = 650 + 70:7 = 650+10 = 660

Answer 2

Let's solve each expression step by step:

a) 100 + (157 - 7 × 8) ÷ 5

Step 1: Perform the multiplication inside the parentheses. 157 - 7 × 8 = 157 - 56 = 101

Step 2: Perform the division. (157 - 7 × 8) ÷ 5 = 101 ÷ 5 = 20.2

Step 3: Add 100 to the result. 100 + (157 - 7 × 8) ÷ 5 = 100 + 20.2 = 120.2

b) 200 - (28 + 9 × 8) ÷ 4

Step 1: Perform the multiplication inside the parentheses. 9 × 8 = 72

Step 2: Perform the addition inside the parentheses. 28 + 72 = 100

Step 3: Perform the division. (28 + 9 × 8) ÷ 4 = 100 ÷ 4 = 25

Step 4: Subtract the result from 200. 200 - (28 + 9 × 8) ÷ 4 = 200 - 25 = 175

c) 1000 - (162 - 6 × 7) ÷ 8

Step 1: Perform the multiplication inside the parentheses. 6 × 7 = 42

Step 2: Perform the subtraction inside the parentheses. 162 - 42 = 120

Step 3: Perform the division. (162 - 6 × 7) ÷ 8 = 120 ÷ 8 = 15

Step 4: Subtract the result from 1000. 1000 - (162 - 6 × 7) ÷ 8 = 1000 - 15 = 985

d) 650 + (133 - 7 × 9) ÷ 7!

Step 1: Perform the multiplication inside the parentheses. 7 × 9 = 63

Step 2: Perform the subtraction. 133 - 63 = 70

Step 3: Evaluate 7! 7! = 7 × 6 × 5 × 4 × 3 × 2 × 1 = 5040

Step 4: Perform the division. (133 - 7 × 9) ÷ 7! = 70 ÷ 5040 ≈ 0.01389

Step 5: Add the result to 650. 650 + (133 - 7 × 9) ÷ 7! ≈ 650 + 0.01389 ≈ 650.01389

So, the solutions are: a) 120.2 b) 175 c) 985 d) Approximately 650.01389