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3.97 1.4简便计算

9.96*1.4=(10-0.04)*1.4=10*1.4-0.04*1.4=14-0.056=13.944 如果对你有帮助,请采纳.谢谢.要采纳最先回答的正确答案哟.祝进步!!!

2.9*1.4= (3-0.1)*1.4= 3*1.4-0.1*1.4= 4.2-0.14= 4.186

0.56÷1.4用简算计算0.56÷1.4=4x0.14÷1.4=0.4

要用简便算法来算,就先把0.99变成1-0点01,然后乘以1.4

分子 分母 同时乘以 10 得 35 / 14 35 = 5 * 7 14 = 2 * 7 所以 35 / 14 = (5 * 7 )/ ( 2 * 7 ) = 5 / 2 = 2.5 望采纳 非常感谢!!!

18.9-18.9÷1.4=(18.9X1.4-18.9)÷1.4=18.9X(1.4-1)÷1.4=18.9x0.4÷1.4=7X2.7X2X0.2÷1.4=2.7X2=5.4

12.93.8 2.71.4怎样简便计算12.93.8 2.71.4=12.9+2.7-(3.8+1.4)=15.6-4.2=11.4

27+249+51+172=(249+51)+(27+172+1)-1=300+200-1=499

4.9=7*0.7 1.4=7*0.2 即0.7/0.2=3.5

0.49÷1.4 =0.49÷(0.4*2) =0.49÷0.7÷2 =0.7÷2 =0.35

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