Toán Lớp 4: Tính nhanh: (235x99+235)- (235x101-235)

(235×99+235)-(235×101-235) =235×(99+1)+235-235×(101-1)-235 =235×100+235-235×100-235 =(23500+235)-(23500-235) = 23500-23500 =0

(235xx99+235)- (235xx101-235) =[235xx(99+1)]-[235xx(101-1)] =(235xx100)-(235xx100) =23500-23500 =0

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Toán Lớp 4: Tính nhanh: (235×99+235)- (235×101-235)

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