题目

怎样简便就怎样计算 ①3.26×5.3+0.74×5.3② ×2.7+6.3÷5+ ③ +（1.6+ ）×10④1.25×2.8× ． 答案：解：①3.26×5.3+0.74×5.3 =（3.26+0.74）×5.3=4×5.3=21.2；② 15 ×2.7+6.3÷5+ 15 = 15 ×2.7+6.3× 15 + 15 ×1=（2.7+6.3+1）× 15 =10× 15 =2；③ 13 +（1.6+ 45 ）×10= 13 +（1.6×10+ 45 ×10）= 13 +24=24 13 ；④1.25×2.8× 1914 =1.25×4×0.7× 1914 =（1.25×4）×（0.7× 1914 ）=5× 1920 = 194

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