Question

40+4x21+2x[100-6x(45-7xb)]=288​

Answer 1

Răspuns:

4×21+2×[100-6×(45-7×b)]=288-40

4×21+2×[100-6×(45-7×b)]=248

21+2×[100-6×(45-7×b)]=248:4

21+2×[100-6×(45-7×b)]=62

2×[100-6×(45-7×b)]=62-21

2×[100-6×(45-7×b)]=41

[100-6×(45-7×b)]=41:2

[100-6×(45-7×b)]=20,5

[6×(45-7×b)]=20,5+100

[6×(45×7×b)]=120,5

(45-7×b)=120,5:6

(45-7×b)=20,083

7×b=20,083+45

7×b=65,083

b=65,083:7

b=9,297

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