估算 X-4.9=6.02 7.89X=23.68
|
(1)x-4.9=6.02,
x-5+5=6+5
x=11;
(2)7.89x=23.68,
8x÷8=24÷8,
x=3;
(3)
+1.09=1+1=2;8 9
(4)
+13 25
=0.5+0.5=1.19 40
估算 X-4.9=6.02 7.89X=23.68
|
(1)x-4.9=6.02,
x-5+5=6+5
x=11;
(2)7.89x=23.68,
8x÷8=24÷8,
x=3;
(3)
+1.09=1+1=2;8 9
(4)
+13 25
=0.5+0.5=1.19 40