How to simplify these questions? 1.99.9X7+11.1X37 2.4.2X4.2+0.42X58 3.1.25X(8+0.8+0.8)

1.wu
2.＝4.2×4.2＋4.2×5.8
＝4.2×（4.2＋5.8）
＝4.2×10
＝42
3.＝1.25×8＋1.25×0.8＋1.25×0.8
＝10＋1＋1
＝12

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