(30000+1000)÷100=310
30000+1000÷100=30010
109+229×3=796
(940-872)×8=544
945÷7×5=675
843÷3×5=1405
У берилия Be
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1) C3H5(C15H31COO)3+3H2O=C3H5(OH)3+3C15H31COOH
2) C3H5(C17H51COO)3+3H2O=C3H5(OH)3+3C17H35COOH
3)C3H5(C17H33COO)3+3H2O=C3H5(OH)3+3C17H33COOH