计算下面各题,能简算的要用简便方法计算.23.4-5.7-4.3 25×50×32 &...
计算下面各题,能简算的要用简便方法计算.23.4-5.7-4.325×50×3299×48+4846×16+16×5465×10214.9+3.7+5.1+6.3...
计算下面各题,能简算的要用简便方法计算.23.4-5.7-4.3 25×50×32 99×48+4846×16+16×54 65×102 14.9+3.7+5.1+6.3
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(1)23.4-5.7-4.3
=23.4-(5.7+4.3)
=23.4-10
=13.4
(2)25×50×32
=25×50×4×8
=(25×4)×(50×8)
=100×400
=40000
(3)99×48+48
=(99+1)×48
=100×48
=4800
(4)46×16+16×54
=16×(46+54)
=16×100
=1600
(5)65×102
=65×(100+2)
=65×100+65×2
=6500+130
=6630
(6)14.9+3.7+5.1+6.3
=(14.9+5.1)+(3.7+6.3)
=20+10
=30.
=23.4-(5.7+4.3)
=23.4-10
=13.4
(2)25×50×32
=25×50×4×8
=(25×4)×(50×8)
=100×400
=40000
(3)99×48+48
=(99+1)×48
=100×48
=4800
(4)46×16+16×54
=16×(46+54)
=16×100
=1600
(5)65×102
=65×(100+2)
=65×100+65×2
=6500+130
=6630
(6)14.9+3.7+5.1+6.3
=(14.9+5.1)+(3.7+6.3)
=20+10
=30.
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