3. 计算下面各题,怎样简便就怎样算。(12分)
4.36+3.2÷2.5= ______
2.5×2.18×0.4= ______
34.2×2.01-0.01×34.2= ______
9.9×2.8+0.28= ______
8.7÷0.2÷0.5= ______
4.8×5.62+0.52×56.2= ______

4.36+3.2÷2.5
=4.36+1.28
=5.64
2.5×2.18×0.4
=2.5×0.4×2.18
=1×2.18
=2.18
34.2×2.01-0.01×34.2
=34.2×(2.01-0.01)
=34.2×2
=68.4
9.9×2.8+0.28
=9.9×2.8+0.1×2.8
=(9.9+0.1)×2.8
=10×2.8
=28
8.7÷0.2÷0.5
=8.7÷(0.2×0.5)
=8.7÷0.1
=87
4.8×5.62+0.52×56.2
=4.8×5.62+5.2×5.62
=(4.8+5.2)×5.62
=10×5.62
=56.2

4. 列式计算。(6分)
(1)13.7减去4.1的差,除以0.4与2的积,商是多少?
(2)1.25与6.4的积,加上13.2除以1.1的商,和是多少?

(1)(13.7-4.1)÷(0.4×2)
=9.6÷0.8
=12
(2)1.25×6.4+13.2÷1.1
=8+12
=20