计算.3.52÷2
计算.3.52÷2.5÷0.43.65×10.115÷(0.15×0.4)1.97×99+1.974.8×7.8-78×0.4212.5×34+25×33....
计算.3.52÷2.5÷0.4 3.65×10.1 15÷(0.15×0.4) 1.97×99+1.97 4.8×7.8-78×0.42 12.5×34+25×33.
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①3.52÷2.5÷0.4 =3.52÷(2.5×0.4) =3.52÷1 =3.52; ②3.65×10.1 =3.65×10+3.65×0.1 =36.5+0.365 =36.865; ③15÷(0.15×0.4) =15÷0.15÷0.4 =100÷0.4 =250; ④1.97×99+1.97 =1.97×(100+1) =1.97×100 =197; ⑤4.8×7.8-78×0.42 =4.8×7.8-7.8×4.2 =(4.8-4.2)×7.8 =0.6×7.8 =4.68; ⑥12.5×34+25×33 =25×17+25×33 =25×(17+33) =25×50 =1250. |
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