问题
解答题
①算式(□+5)÷7-3=5,则□里填______
②算式(□+4)÷3-2=0,则□里填______
③算式(□-5)×3+5=32,则□里填______.
答案
(1)(x+5)÷7-3=5,
(x+5)÷7-3+3=5+3,
(x+5)÷7×7=8×7,
x+5-5=56-5,
x=51,
故□=51;
(2)(x+4)÷3-2=0,
(x+4)÷3-2+2=0+2,
(x+4)÷3×3=2×3,
x+4-4=6-4,
x=2,
故□=2;
(3)(x-5)×3+5=32,
(x-5)×3+5-5=32-5,
(x-5)×3÷3=27÷3,
x-5+5=9+5,
x=14,
故□=14;
故答案依次为:51,2,14.