(1)5.24+7.9+4.76,
=(5.24+4.76)+7.9,
=10+7.9,
=17.9;
(2)25×37×4,
=25×4×37,
=100×37,
=3700;
(3)9.9×3.6,
=(10-0.1)×3.6,
=36-0.36,
=35.64;
(4)15.6×101-15.6,
=15.6×(101-1),
=15.6×100,
=1560;
(5)4.5÷5÷9,
=4.5÷(5×9),
=4.5÷45,
=0.1.
(1)5.24+7.9+4.76,
=(5.24+4.76)+7.9,
=10+7.9,
=17.9;
(2)25×37×4,
=25×4×37,
=100×37,
=3700;
(3)9.9×3.6,
=(10-0.1)×3.6,
=36-0.36,
=35.64;
(4)15.6×101-15.6,
=15.6×(101-1),
=15.6×100,
=1560;
(5)4.5÷5÷9,
=4.5÷(5×9),
=4.5÷45,
=0.1.