(1)5.7-0.57=5.13;
(2)[3/4]×80%=0.6;
(3)14-4[2/3]=9[1/3];
(4)1.77+1.3=3.07;
(5)15+35%=15.35; (6)[1/3+
1
2]=[5/6]; (7)2.4×[3/8]=0.9; (8)[3/4]×4÷4×[3/4]=[9/16].
(1)5.7-0.57=5.13;
(2)[3/4]×80%=0.6;
(3)14-4[2/3]=9[1/3];
(4)1.77+1.3=3.07;
(5)15+35%=15.35; (6)[1/3+
1
2]=[5/6]; (7)2.4×[3/8]=0.9; (8)[3/4]×4÷4×[3/4]=[9/16].