① :x= :
②1.8x﹣1.4x=96
= ﹣0.25= 0÷5=
= 5.4×= 80×0.7=
x+9=30 x+32×=28 3y﹣20%y=56
46+25= 840÷60= 0.25×8= 2﹣= 4÷12=
15×20= ÷= 1×= 80×110%= 401÷50≈