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一、口算。
$1.4×0.5=$
$0.72÷1.2=$
$37.2÷6=$
$4.8+5.08=$
$3.8×0.3=$
$4.8÷0.08=$
$4.2+5.08=$
$0.75÷1.5=$
$1.4×0.5=$
0.7
$1.7×0.5=$0.85
$c-0.16c-0.3c=$0.54c
$0.72÷1.2=$
0.6
$3.2d×0.1d=$0.32d²
$(2.82-1.02)÷0.06=$30
$37.2÷6=$
6.2
$1.08÷0.36=$3
$1÷1.25÷4=$0.2
$4.8+5.08=$
9.88
$3.61+0.9=$4.51
$3.72-0.59+0.28=$3.41
$3.8×0.3=$
1.14
$12.8-0.28=$12.52
$0.45+3.5+0.05=$4
$4.8÷0.08=$
60
$7.2÷0.072=$100
$3.6×0.7÷3.6×0.7=$0.49
$4.2+5.08=$
9.28
$1.05-0.95=$0.1
$13.5-6.2-3.8=$3.5
$0.75÷1.5=$
0.5
$8.4÷0.12=$70
$3.22+3.22×99=$322
答案
一、0.7 0.85 0.54c 0.6 0.32d² 30 6.2 3 0.2 9.88 4.51 3.41 1.14 12.52 4 60 100 0.49 9.28 0.1 3.5 0.5 70 322
二、计算下面各题,怎样简便就怎样计算。
$0.45÷50+5.8×0.19$ $1.25×3.6+1.25×3.4+1.25$
$36÷[1.44×(0.1-0.05)]$ $16.54-(5.54+1.63)-3.37$
$0.45÷50+5.8×0.19$ $1.25×3.6+1.25×3.4+1.25$
$36÷[1.44×(0.1-0.05)]$ $16.54-(5.54+1.63)-3.37$
答案
二、1.111 10 500 6
解析
$0.45÷50+5.8×0.19$
$=0.009+1.102$
$=1.111$
$1.25×3.6+1.25×3.4+1.25$
$=1.25×(3.6+3.4+1)$
$=1.25×8$
$=10$
$36÷[1.44×(0.1-0.05)]$
$=36÷[1.44×0.05]$
$=36÷0.072$
$=500$
$16.54-(5.54+1.63)-3.37$
$=16.54-5.54-1.63-3.37$
$=(16.54-5.54)-(1.63+3.37)$
$=11-5$
$=6$
$=0.009+1.102$
$=1.111$
$1.25×3.6+1.25×3.4+1.25$
$=1.25×(3.6+3.4+1)$
$=1.25×8$
$=10$
$36÷[1.44×(0.1-0.05)]$
$=36÷[1.44×0.05]$
$=36÷0.072$
$=500$
$16.54-(5.54+1.63)-3.37$
$=16.54-5.54-1.63-3.37$
$=(16.54-5.54)-(1.63+3.37)$
$=11-5$
$=6$
