1.连一连。

(5+8)×0.4 —— 5×0.4+8×0.4
8.8×1.25 —— (8+0.8)×1.25
3.6×4×2.5 —— 3.6×(4×2.5)
1.25×2.6×8 —— (1.25×8)×2.6

2. 算一算。
$2.5×(3.8×0.4)$
$7.69×101$
$46×0.33+54×0.33$
$95.7×0.28+6.3×0.28-0.28×2$
$0.25×39+0.25$
$0.125×72$

$2.5×(3.8×0.4)$
$=2.5×0.4×3.8$
$=1×3.8$
$=3.8$
$7.69×101$
$=7.69×(100+1)$
$=7.69×100 +7.69×1$
$=769 +7.69$
$=776.69$
$46×0.33+54×0.33$
$=(46+54)×0.33$
$=100×0.33$
$=33$
$95.7×0.28+6.3×0.28-0.28×2$
$=(95.7+6.3-2)×0.28$
$=100×0.28$
$=28$
$0.25×39+0.25$
$=0.25×(39+1)$
$=0.25×40$
$=10$
$0.125×72$
$=0.125×8×9$
$=1×9$
$=9$