0.38什么意思 4.3乘0.38 +0.43 乘4.7 +0.043乘15的简便计算

4.3乘0.38 +0.43 乘4.7 +0.043乘15的简便计算  

4.3乘0.38 +0.43 乘4.7 +0.043乘15的简便计算

4.3x0.38+0.43
二4.3(0.38+1)
二1.634+4.3
二5.934

6.752—【4.7乘(0.54—0.38)加2.8】简便计算

6.752—【4.7乘(0.54—0.38)加2.8】
=6.752-【4.7×0.16+2.8】
=6.752-【0.752+2.8】
=6.752-0.752-2.8
=6-2.8
=3.2

4.3乘以101减0.43简便计算

=0.43×10×101-0.43
=0.43×1010-0.43
=0.43×（1010-1）
=0.43×（1000+10-1）
=0.43×1000+0.43×10-0.43×1
=430+4.3-0.43
=433.87

0.43乘1.8除以0.43乘1.8简便计算

解：（0.43×1.8）÷（0.43×1.8）=（0.43÷0.43）×（1.8÷1.8）=1×1=1

11.4乘4.7-4.7乘1.41简便计算

11.4乘4.7-4.7乘1.41简便计算
11.4乘4.7-4.7乘1.41
=4.7*（11.4-1.4）
=4.7*10
=47

0.38乘1.25乘1.4用简便计算

0.38×1.25×1.4
=（0.19×0.7）×（2×1.25×2）
=0.133×5
=0.665

3.6乘5.7加36乘0.43简便计算

3.6×5.7+36×0.43
=3.6×5.7+3.6×4.3
=3.6×(5.7+4.3)
=3.6×10
=36

8.6乘1.1乘4.7简便计算

解：8.6x1.1x4.7
=8.6x1.1x(5-0.3)
=8.6x(5.5-0.33)
=(8+0.6)x5.17
=41.36+3.102
=44.462

4.3×0.38 0.43×4.7＋0.043×15=( )怎样简算?

4.3×0.38 0.43×4.7＋0.043×15=( )怎样简算?
4.3×0.38 0.43×4.7＋0.043×15
=4.3*（0.38+0.47+0.15）
=4.3*1
=4.3

简便计算，54.9乘0.38

解：原式=54.9x（0.3+0.08）
=54.9x0.3+54.9x0.08
=16.47+4.392
=20.862
分析：主要考察拆分法和分配律的运用。