(1)3.7×0.26=0.962; 3.7×0.2 6 . 2 2 2 7 40.9 6 2验算: 0.2 6 × 3.7 . 1 8 2 7 80.9 6 239.78÷1.3=30.6; 3 0.6 133 9 7.8 3 9 7 8 7 8 0验算: 3 0.6× 1.3 . 9 1 8 3 0 6 3 9.7 89.6728÷2.14=4.52; 4.5 2 2149 6 7.2 8 8 5 6 1 1 1 2 1 0 7 0 4 2 8 4 2 8 0(2)11÷90≈0.12; 0.1 2 2 901 1 0 9 0 2 0 0 1 8 0 2 0 0 1 8 0 2 00.2704÷13≈0.02; 0.0 2 0 8 130.2 7 0 4 2 6 1 0 4 1 0 4 03.87×2.45≈9.48. 3.8 7×2.4 5 . 1 9 3 5 1 5 4 8 7 7 4 . 9.4 8 1 5