二、计算下面各题,怎样简便就怎样计算。
$25×1.34×0.4$ $3.8×1.4+18.2÷0.7$
$9.4-1.2÷0.6+6.24$ $6.73+2.56+1.44+3.27$
$2.8×3.2+3.2×7.2$ $4.39×9.8+0.439+0.439$
$2.5×56+4.5×65$ $(14.6+4.12)÷1.8-5.7$
$8.07×10.8-0.8×8.07$ $30.8÷[14-(9.85+1.07)]$

13.4 31.32 13.64 14 32 43.9 432.5 4.7 80.7 10

25×1.34×0.4
=25×0.4×1.34
=10×1.34
=13.4
3.8×1.4+18.2÷0.7
=5.32+26
=31.32
9.4-1.2÷0.6+6.24
=9.4-2+6.24
=7.4+6.24
=13.64
6.73+2.56+1.44+3.27
=(6.73+3.27)+(2.56+1.44)
=10+4
=14
2.8×3.2+3.2×7.2
=3.2×(2.8+7.2)
=3.2×10
=32
4.39×9.8+0.439+0.439
=4.39×9.8+4.39×0.1+4.39×0.1
=4.39×(9.8+0.1+0.1)
=4.39×10
=43.9
2.5×56+4.5×65
=140+292.5
=432.5
(14.6+4.12)÷1.8-5.7
=18.72÷1.8-5.7
=10.4-5.7
=4.7
8.07×10.8-0.8×8.07
=8.07×(10.8-0.8)
=8.07×10
=80.7
30.8÷[14-(9.85+1.07)]
=30.8÷[14-10.92]
=30.8÷3.08
=10