=+
=;
(4)16+(4.5﹣2.7)÷0.9
=16+1.8÷0.9
=16+2
=18;
(5)()
=()×30
=×36+×36﹣×36
=4+30﹣21
=34﹣21
=13;
(6)33×0.29+6.7×2.9
=33×0.29+67×0.29
=(33+67)×0.29
=100×0.29
=29.
3.【解答】解:(1)1650﹣480÷16
=1650﹣30
=1620
(2)2.5×8÷2.5×8
=20÷2.5×8
=8×8
=64
(3)
=÷[÷]
=÷
=
(4)()×35
=1×35﹣×35+×35
=35﹣10+21
=46
4.【解答】解:(1)12x﹣15=9
12x﹣15+15=9+15
12x=24
12x÷12=24÷12
x=2
(2)
+x﹣=﹣
x=