(1)25+15=40,2×40=80,1600÷80=20, 列成综合算式是:1600÷[2×(25+15)]; (2)825-45=780,780÷60=13,15×3=45, 列成综合算式是:(825-15×3)÷60; (3)30-10=20,3×20=60,1200+60=1260, 列成综合算式是:1200+3×(30-10); (4)46-16=30,30×24=720,8+38=46, 列成综合算式是:(8+38-16)×24. 故答案为:1600÷[2×(25+15)],(825-15×3)÷60,1200+3×(30-10),(8+38-16)×24. |
(1)25+15=40,2×40=80,1600÷80=20列成综合算式是:
1600÷[2×(25+15)];
(2)30-10=20,3×20=60,1200+60=1260列成综合算式是:
1200+3×(30-10).
故答案为:1600÷[2×(25+15)],1200+3×(30-10).