数学题,3.8✖️1.4➕18.2➗0.7用简便方法做怎么做？

Question

如题所述

Answer 1

根据题意，简便算法如下：
3.8✖️1.4➕18.2➗0.7
=（4-0.2）✖️1.4+182➗7
=4x1.4-0.2x1.4+26
=5.6-0.28+26
=31.32

Answer 2

没简便方法：3.8×1.4+18.2÷0.7=31.32

Answer 3

3.8×1.4+18.2÷0.7
=3.8×1.4+182÷7
=3.8×1.4+26
=（3+0.8）×1.4+26
=4.2+1.12+26
=5.32+26
=31.32

Answer 4

3.8×14/10+18.2×7/10
=3.8×14/10+9.1×14/10
=14/10(3.8+9.1)
=14/10×129/10
=(10+4)×129/100
=12.9+5.16=18.06

Answer 5

3.8×1.4+18.2÷0.7
=(4-0.2)×1.4+26
=4×1.4-0.2×1.4+26
=5.6-0.24+26
=5.36+26
=31.36