3.7×12.8+3.6×·7.5

3.7×12.8+3.6×·7.5

用简便方法计算3.7*12.8 3.6*7.4 -
=3.7*2*6.4+3.6*7.4 =7.4*6.4+7.4*3.6 =7.4*（6.4+3.6）7.4*10 =74
=3.7×6.3 =23.31
简算3.7*12.8+0.37*827 -
3.7*12.8+0.37*827 =3.7*12.8+3.7*82.7 =3.7*(12.8+82.7)=3.7*95.5 =3.7*100-3.7*4.5 =350-(3.7*9)/2 =350-(37-3.7)/2 =350-16.65 =333.35
=3.7*12.8+3.7+3.4*86.2 =3.7*13.8+3.4*86.2 =（3.4+0.3）13.8+3.4*86.2 =3.4*13.8+0.3*13.8+3.4*86.2 =3.4*（13.8+86.2）0.3*13.8 =3.4*100+0.3*13.8 =340+4.14 =344.14 所以答案是344.14。其实我觉得题目是不是给错了，中间是不是好了吧！
12.8x3.7 12.8x6.3简便计算 -
12.8x3.7=47.36 12.8x6.3=80.64
如图，
12.8×3.7-6.5×3.7的过程 -
12.8×3.7-6.5×3.7 =(12.8-6.5)×3.7 =6.3×3.7 =23.31
3.7×12.8-37×0.28 =3.7×（12.8-2.8）3.7×10 =37

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