A) 68 + 95 + 32 + 5 = (68 + 32 ) + (95 + 5)= 100 + 100= 200B) 10...

Câu 4.a) 68 + 95 + 32 + 5 = (68 + 32 ) + (95 + 5)= 100 + 100= 200b) 102 + 7 +243 + 98 = (102 + 98) + (7 + 243)= 200 + 250= 450