问题
填空题
当x=7时,2x-4.5=______;当y=______时,4(y+1.3)=12.
答案
(1)当x=7时
2x-4.5=2×7-4.5=9.5
(2)4(y+1.3)=12
4(y+1.3)÷4=12÷4
y+1.3-1.3=3-1.3
y=1.7.
故答案为:9.5,1.7.
当x=7时,2x-4.5=______;当y=______时,4(y+1.3)=12.
(1)当x=7时
2x-4.5=2×7-4.5=9.5
(2)4(y+1.3)=12
4(y+1.3)÷4=12÷4
y+1.3-1.3=3-1.3
y=1.7.
故答案为:9.5,1.7.