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请简便计算9.8×6.5和0.87×10.1这两道题,谢谢!

8.7 *(10+0.1)-0.87 =8.7*10+8.1*0.1-0.87=87

简便计算 0.87×10.1 =0.87x(10+0.1) =0.87x10+0.87x0.1 =8.7+0.087 =8.787

8.7×10.1-0.87 =8.7×(10.1-0.1) =8.7×10 =87

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