含有小括号的三步计算式题 1. (1) (15+2-7)×3 = 10×3 = 30 (2) (21+9)×(21-9) = 30×12 = 360 2. (1) 15×4+16÷4 = 60+4 = 64 (2) 15×(4+16)÷4 = 15×20÷4 = 300÷4 = 75 (3) 15×(4+16÷4) = 15×(4+4) = 15×8 = 120 (4) (15×4+16)÷4 = (60+16)÷4 = 76÷4 = 19 (puXue.com) 3. (1)2×5+6+8=24 (2)4+5+6+9=24 (3)3×4+5+7=24 (4)2+3×5+7=24 (答案不唯一) |