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38*27+45*16简便运算

38×27+42×38=38(27+42)

4×38×5 二4X5x38 二20X38 二7600

27*4*5 =27*20 =540 15*7*6 = 3*7*5*6 =21*30 =630

4.26+(5.32-2.16) =(4.26-2.16)+5.32 =2.1+5.32 =7.42

(1)774÷(27+16),=774÷43,=18;(2)39+144+61,=39+61+144,=100+144,=244;(3)27×4×5,=27×(4×5),=27×20,=540;(4)857-318-182,=857-(318+182),=857-500,=357.

小提示:两个数相乘,其中一个因数扩大若干倍,另一个因数缩小若干倍,其积不变 具体做法:运用上面所说的定义,弄出相同的因数,然后用乘法分配率 则原式=1/5*16+1/20*16+1/5*16 =16*(1/5+1/20+1/5) =16*9/20 =36/5(7.2) 呵呵,加油!...

5*25*[40+4] 解: =5x25x40+5x25x4 =5x(25x40)+5x(25x4) =5x1000+5x100 =5000+500 =5500 祝学习进步。

14.6+8.26+5.26+27.4 =(14.6+27.4)+8.26+5.26 =42+5.26+3+5.26 =42+5.26x2+3 =45+10.52 =55.52

用简便方法计算4·3-1·27+5·7-3·73 解答: 用简便方法计算 4·3-1·27+5·7-3·73 =4.3+5.7-(1.27+3.73) =10-5 =5

(5/6+3/4)x3/38 =(10/12+9/12)x3/38 =19/12x3/38 =1/8 这题没有简便方法

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