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简介:
加法交换律
0.75+9.8+0.25
=(0.75+0.25)+9.8
=1+9.8
=10.8
加法结合律
48.5+0.4+0.6
=48.5+(0.4+0.6)
=48.5+1
=49.5
乘法交换律
2.5×5.6×0.4
=(2.5×0.4)×5.6
=1×5.6
=5.6
乘法结合律
99×12.5×0.8
=(12.5×0.8)×99
=10×99
=990
加法交换律与结合律
6.5+0.28+3.5+0.72
=(6.5+3.5)+(0.28+0.72)
=10+1
=11
乘法交换律与结合律
2.5×1.25×0.4×0.8
=(2.5×0.4)×(1.25×0.8)
=1×1
=1
乘法分配律(提取式)
1.35×12-1.35×2
=1.35×(12-2)
=1.35×10
=13.5
乘法分配律(添项)
3.5×8+3.5×3-3.5
=3.5×8+3.5×3-3.5×1
=3.5×(8+3-1)
=3.5×10
=35