=
(3) +3-( + )
= +3- -
= - - +3
= - +3
=0+3
=3
(4) × × -
= × × -
= -
= -
=
(5) +( - )÷
= + ÷
= +
=
(6) +( + )×
= + × + ×
= + +
= + +
=
=
26. (1) 23+3x=41.6
解:3x=41.6-23
3x=18.6
x=6.2
(2) 1.2x-x=1.04
解:0.2x=1.04
x=5.2
(3)
解:
五、解答题
27.①4+0.5×6=7(平方厘米)
②6×1=6(平方厘米)
③5+0.5×2=6(平方厘米)
答:①图形的面积是7平方厘米.②图形的面积是6平方厘米.
28. (1)解:
(2)作图如下: