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5.(1)
四.
2.
25×1.25×32
=25×4×(1.25×8)
=100ch310
=1000
(3.75+4.1+2.35)×9.8
=(3.75+2.35+4.1)×9.8
=(6.1+4.1)×9.8
=10.2×9.8
=(10+0.2)×(10-0.2)
=100-0.04
=99.96
3.
5400-2940÷28×27
=5400-105×27
=5400-2835
=2565
(20.2×0.4+7.88)÷4.2
=(8.08+7.88)÷4.2
=15.96÷4.2
=3.8
240+10÷[2-(1÷5+0)]
=240+10÷(2-0.2)
=240+10÷1.8
=240+50/9
=245又5/9
4.
(1)0.6×2.25÷(3.2-1.85)
=0.6×2.25÷1.35
=1.35÷1.35
=1
(2)30×25%-1.5
=7.5-1.5
=6
四.
2.
25×1.25×32
=25×4×(1.25×8)
=100ch310
=1000
(3.75+4.1+2.35)×9.8
=(3.75+2.35+4.1)×9.8
=(6.1+4.1)×9.8
=10.2×9.8
=(10+0.2)×(10-0.2)
=100-0.04
=99.96
3.
5400-2940÷28×27
=5400-105×27
=5400-2835
=2565
(20.2×0.4+7.88)÷4.2
=(8.08+7.88)÷4.2
=15.96÷4.2
=3.8
240+10÷[2-(1÷5+0)]
=240+10÷(2-0.2)
=240+10÷1.8
=240+50/9
=245又5/9
4.
(1)0.6×2.25÷(3.2-1.85)
=0.6×2.25÷1.35
=1.35÷1.35
=1
(2)30×25%-1.5
=7.5-1.5
=6
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