人教版六年级上册数学分数乘法第3课时乘法运算定律推广到分数同步精练答案
1乘法运算定律推广到分数第1题答案
(1)3/4;15/28
(2)9;11;3/40;3/2
(3)2/9;45;一;2/9;9/2;9
2乘法运算定律推广到分数第2题答案
(1)43/44
(2)11/18
(3)23/24
(4)3/2;一样
3乘法运算定律推广到分数第3题答案
(1)32×(1/4-1/8)
=32×1/4-32×1/8
=8-4 =4
(2)63×5/62
=(62+1)×5/62
=62×5/62+1×5/62
=5+5/62
=315/62
(3)6/13×1/7+8/13×1/7
=(6/13+8/13)×1/7
=14/13×1/7
=2/13
4乘法运算定律推广到分数第4题答案
(1)错;3/5×5-2 =3-2 =1
(2)错;2/9+5/9×9/10 =4/18+9/18 =13/18
5乘法运算定律推广到分数第5题答案
1-3/10×3=1/10(m)
6乘法运算定律推广到分数第6题答案
4/5×3/10×75=18(元)
7乘法运算定律推广到分数第7题答案
(1)3/2-5/8×2/3
=2/3×(1-5/8)
=3/2×3/8
=1/4
(2)4/13×2/7+4/7×11/13
=4/7×2/13+4/7×11/13
=4/7×(2/13+11/13)
=4/7