Question

0.37×0.7+6点3×0.07的简便运算？

零点37×0点7+6点3×0点07的简便运算

Answer 1

【注意积不变原理的应用，也就是一个因数扩大几倍，另一个因数缩小几倍，积不变】0.37×0.7+6.3×0.07
＝0.37×0.7+0.63×0.7
＝（0.37+0.63）×0.7
＝1×0.7
＝0.7
【所以要先利用积不变原理，改变小数点的位置，构成乘法分配律，之后再进行简便运算即可】

Answer 2

0.37×0.7+6.3×0.07
=0.37×0.7+6.3×0.1×0.7
=0.7×（0.37+6.3×0.1）
=0.7×（0.37+0.63）
=0.7×1
=0.7

Answer 3

0.37×0.7+6.3×0.07=0.37×0.7+0.63×0.7=0.7

Answer 4

0.37×0.7+6.3×0.07
=0.37×0.07×10+6.3×0.07
=3.7×0.07+6.3×0.07
=（3.7+6.3)×0.07
=10×0.07
=0.7