《2025年口算题卡河北少年儿童出版社五年级数学下册苏教版》

解方程。
① 4.5x + 3.5x = 1.6 x = ______
② 3x + 5x = 48 x = ______
③ 14x - 8x = 12 x = ______
④ 6×5 + 2x = 44 x = ______
⑤ 56x - 50x = 30 x = ______
⑥ 12x - 8x = 4.8 x = ______
⑦ x - 0.7x = 3.6 x = ______
⑧ x + 8.3 = 10.7 x = ______
⑨ x + 5.3 = 7.4 x = ______
⑩ 3(x + 0.5) = 21 x = ______
⑪ 1.4×8 - 2x = 6 x = ______
⑫ x÷5 + 9 = 21 x = ______
⑬ 0.1(x + 6) = 3.3×0.4 x = ______
⑭ (x - 140)÷70 = 4 x = ______
⑮ 7x = 91 x = ______
⑯ x + 3.1 = 20.9 x = ______
⑰ 12 + x = 19 x = ______
⑱ x + 29.4 = 78.6 x = ______
⑲ 3 + x = 13.7 x = ______

答案： 0.2 6 2 7 5 1.2 12 2.4 2.1 6.5 2.6 60 7.2 420 13 17.8 7 49.2 10.7