0.13×3.67 1.3×0.133如果中间空白是加号
0.13×3.67 +1.3×0.133
=0.13x3.67+0.13x1.33
=0.13x(3.67+1.33)
=0.13x5
=0.65
0.13×3.67
=（0.1+0.03）×3.67
=0.367+0.1101
=0.4771
1.3×0.133
=（1+0.3）×0.133
=0.133+0.0399
=0.1729
0.13×3.67+1.3×0.133
=1.3×0.367+1.3×0.133
=1.3×(0.367+0.133)
=1.3×0.4
=0.52
3.12×0.13÷3.12
=3.12÷3.12×0.13
=1×0.13
=0.13
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