1)1,44a^2b^4+0,56a^2b^4/21ab-19ab=2a^2b^4/2ab=ab^3
2)2*3*(-1/8*3*2)^3*(-2,5*4*(-1))*(1/9*3*1)^2=6*(-27/64)*10*1/81*9=81/32*10*1/9=45/16
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1)1,44a^2b^4+0,56a^2b^4/21ab-19ab=2a^2b^4/2ab=ab^3
2)2*3*(-1/8*3*2)^3*(-2,5*4*(-1))*(1/9*3*1)^2=6*(-27/64)*10*1/81*9=81/32*10*1/9=45/16