题目五年级数学(方程)习题及答案(1) x+47=123 (2) x+3=86 (3) x+5=52(4) x-17=80 (5) x-20=53 (6) x-9=81(7) x+7.2=9 (8) x+4.4=7.2 (9) x+6.3=11.4(10) x-5.9=4 (11) x-3.5=5.8 (12) x-1.3=8.5(13) 98+x=150 (14) 61+x=128 ...