www.5129.net > 7.2×3.6+3.8×3.6%3.6简算

7.2×3.6+3.8×3.6%3.6简算

4.8×3.6-3.8×3.6 =(4.8-3.8)x3.6 =1x3.6 =3.6 行家正解,不明白可以追问!祝您学习进步 满意请点击下面的【选为满意回答】按钮,O(∩_∩)O谢谢

7.2×3.6+3.6×2.8=(7.2+2.8)x3.6 =36

3.6x7.2+2.8x3.6+36 =3.6x7.2+2.8x3.6+3.6x10 =3.6x(7.2+2.8+10) =3.6x20 =72

7.2×66+3.6×68 =7.2×66+7.2×34 =7.2×(66+34) =7.2×100 =720

7.2×3.6+72×0.65-0.72 =7.2x(3.6+6.5-0.1) =7.2x10 =72

3.6*102-7.2 =3.6*2*51-7.2 =7.2*51-7.2 =7.2(51-1) =7.2*50 =7.2*100*(1/2) =72*(1/2) =36 不懂可追问 满意请采纳 谢谢

8.7x3.8+(4.9-3.6)×3.8 =8.7×3.8+1.3×3.8 =(8.7+1.3)×3.8 =10×3.8 =38

3.6×7.3+3.7×7.2 =3.6×7.3+7.4×3.6 =3.6×(7.3+7.4) =3.6×14.7 =52.92

=7.2(3.6+10) =7.2×13.6 =97.92

(1+ 7.2%)(1-3.6%)+7.2%×3.6% =1+7.2%-3.6%-7.2%×3.6%+7.2%×3.6% =1+7.2%-3.6% 7.2%×3.6%= 0.002592这个数值特别小,对计算的结果影响不大,可以忽略, 所以就可以推出 (1+ 7.2%)(1-3.6%)≈1+7.2%-3.6% 行测做题的时候都是讲究快的,能约等于的数...

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