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19.8/3.8的简便计算是什么?

19.8除以3.8的简便是19.8÷3.8≈5.21。

130*35 =130*70/2 =9100/2 =4550 或: 130*35 =(100+30)*35 =3500+1050 =4550

3.8÷1.25÷0.2÷0.8 =(3.8÷0.2)÷(1.25x0.8) =19÷1 =19

69.8*7.2+18.3*2.6 =70*7.2-0.2*7.2+18.3*3-18.3*0.4 =504-1.44+54.9-7.32 =558.9-8.76 =550.14 2.5*(19.8-3.7*3.8) =2.5*(19.8-3.4*4+3.7*0.2) =2.5*(19.8-13.6+0.74) =2.5*6.94 =2.5*7-2.5*0.06 =17.5-0.15 =17.35 89.3*100.1 =89.3*100...

19.4✖️6.7+2.3 ×19.4 =19.4×(6.7+2.3) =19.4×9 =174.6 16.2×2+3.8✖️2 =(16.2+3.8)×2 =20×2 =40 (8+0.8)✖️1.25 =8×1.25+0.8×1.25 =10+1 =11

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