用等式性质解方程练习1.(1)x=32 √ (2)x=20√ (3)x=3 √ (4)x=7√ (5)x=100√2.(1)- 36 28 (2)+ 0.8 2.7 (3)÷3 15 (4)x1.6 3.23. x+3.8=6.3 x=6.3-3.8 x=2.5 0.4+x=2.3 x=2.3-0.4 x=1.9 x-1.8=4 x=4+1.8 x=5.81.6x=6.4 x=6.4÷1.6 x=4 x÷7=0.3x=0.3×7x=2.1 x÷3=2.1x=2.1×3x=6.34.(1) 5.5+x=10 x=10-5.5 x=4.5 (2)5x=60 x=60÷5 x=125.(1)x-98=2 x=98+2 x=100 答:付出100元 (2)x-45=1 |