(1)0.25×3=0.75; 9.1÷1.3=7; 0.56×100=56; 4.5÷0.9=5;
(2)3.3×0.4=1.32; 6.4÷0.08=80; 5.1÷1.7=3; 1×0.845=0.845;
(3)8×(2.5+0.25)=22; 15÷0.15=100; 4.2÷0.14=30; 0.81÷0.9=0.9;
(4)13.5-6.2-3.8=3.5; 4.9+8.7+5.1=18.7; 2.4×1.25=3; 1÷0.05=20.
(1)0.25×3=0.75; 9.1÷1.3=7; 0.56×100=56; 4.5÷0.9=5;
(2)3.3×0.4=1.32; 6.4÷0.08=80; 5.1÷1.7=3; 1×0.845=0.845;
(3)8×(2.5+0.25)=22; 15÷0.15=100; 4.2÷0.14=30; 0.81÷0.9=0.9;
(4)13.5-6.2-3.8=3.5; 4.9+8.7+5.1=18.7; 2.4×1.25=3; 1÷0.05=20.