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67 * 99 + 67 = (99 + 1) * 67 what is the operation law
distributive law
401×99=______ ×99+______ ．
401 × 99, = (400 + 1) × 99, = 400 × 99 + 1 × 99, = 39600 + 99, = 39699
Simple calculation of 8.9 △ 10.1 △ 1.01 + 99 × 89
8.9÷10.1÷1.01+99×89=89÷10.1÷10.1+99×89=89×(1÷10.1²+99)
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