乘除法的灵活运用
25×17×4×2
=(25×4)×(17×2)
= 100×34
= 3400
32×4×25×3
=(25×4)×(32×3)
= 100×96
= 9600
72×125
= (9×8) ×125
= 9×(8×125)
= 9×1000
= 9000
32 ×25 ×125
=(4 × 8) ×25 ×125
=(4 × 25) ×(8 × 125)
= 100 ×1000
= 100000
乘除法的灵活运用
600÷25÷4
= 600÷(25×4)
= 600÷100
= 6
1000÷(125×4)
= 1000 ÷125 ÷4
= 8 ÷4
= 2
乘除法的灵活运用
98×6+101×6+6
=6×(98+101+1)
=6×200
=1200
102×15
=(100+2) ×15
= 100 ×15+2 ×15
= 1500+30
= 1530
乘法分配律的灵活运用
125 ×(4+8)
= 125 ×4+125 ×8
= 500+1000
= 1500
87 × 79+87×21
= 87 ×(79+21)
= 87 ×100
= 8700
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