1. 根据每组第一个算式,在括号里填上合适的数
$2.7\times4.3 = 11.61$ $0.27\times6.5 = 1.755$
( )×( ) = 11.61 ( )×( ) = 1.755
( )×( ) = 1.161 ( )×( ) = 175.5
( )×( ) = 116.1 ( )×( ) = 0.1755
$2.7\times4.3 = 11.61$ $0.27\times6.5 = 1.755$
( )×( ) = 11.61 ( )×( ) = 1.755
( )×( ) = 1.161 ( )×( ) = 175.5
( )×( ) = 116.1 ( )×( ) = 0.1755
答案:
略
2. 计算
$2.07\times3.6$ $0.86\times30$ $3.72\times0.16$ $0.32\times0.12$
$13.4 - 3.4\times2.4$ $2.31\times1.2 + 1.2\times7.69$ $3.4\times(1.09 - 0.19)$
$2.07\times3.6$ $0.86\times30$ $3.72\times0.16$ $0.32\times0.12$
$13.4 - 3.4\times2.4$ $2.31\times1.2 + 1.2\times7.69$ $3.4\times(1.09 - 0.19)$
答案:
7.452 25.8 0.5952 0.0384 5.24 12 3.06
3. 解决问题
一头牛高1.58米,一头大象的高度比一头牛高度的2倍多0.3米。这头大象高多少米?
一头牛高1.58米,一头大象的高度比一头牛高度的2倍多0.3米。这头大象高多少米?
答案:
$1.58\times2 + 0.3 = 3.46$(米)
4. $1.2\times1.25$
= ( )×( ) + ( )×( ) +
( )×( ) + ( )×( )
= ( )

= ( )×( ) + ( )×( ) +
( )×( ) + ( )×( )
= ( )
答案:
原式 $= 1\times1 + 1\times0.25 + 0.2\times1 + 0.2\times0.25 = 1.5$
查看更多完整答案,请扫码查看