ДАМ 20 БАЛЛОВ!
с решением, пожалуйста.
4. 0,1b-4b+0,009b
7. -0,14b+0,18b-(-0,23b)+0,14b
8. 5/9z-1 3/4z+17/18z
13. 1/3y-(2y-2/3)
18. 3×(0,4x+7)-4×(0,8x-3)
20. 5a-(3a+(2a-1)
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