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小数方程计算专项练习进步题

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x+2.5=13 x+2.5﹣2.5=13﹣2.5 x=11.5 (42)2x﹣2+1.8=3.6 2x﹣0.2=3.6 x=0.18;

(46)6x+4x﹣11=32.9 10x﹣11+11=32.9+11 10x÷10=43.9÷10 2x+0.2﹣0.2=3.6+0.2 2x=3.8 2x÷2=3.8÷2 x=1.9

(43)7(x﹣1.2)=3.57 7(x﹣1.2)÷7=3.57÷7 x﹣1.2=0.51 x+1.2﹣1.2=1.2+0.51 x=1.71 (44)2+1.8﹣2x=3.6 3.8﹣2x+2x=3.6+2x 3.8﹣3.6=3.6+2x﹣3.6 0.2÷2=2x÷2 x=0.1;

(45)7x÷0.3=4.2 7x÷0.3×0.3=4.2×0.3 7x÷7=1.26÷7

x=4.39; 47)7(x﹣1.2)=2.87 7(x﹣1.2)÷7=2.87÷7 x﹣1.2+1.2=0.41+1.2 x=1.61 48)2.4+3.4x=5.8 2.4+3.4x﹣2.4=5.8﹣2.4 3.4x=3.4 3.4x÷3.4=3.4÷3.4 x=1; 49)5(x﹣1.2)=35 5(x﹣1.2)÷5=35÷5 x﹣1.2=7 x﹣1.2+1.2=7+1.2 x=8.2; 50)2.5x+51=17×8

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2.5x+51=136 2.5x+51﹣51=136﹣51 2.5x=85 2.5x÷2.5=85÷2.5 x=34. 16x+1.5=25.5 16x+1.5﹣1.5=25.5﹣1.5 16x=24 16x÷16=24÷16 x=1.5; (51)2.4x+1.6x=2.2 4x=2.2 4x÷4=2.2÷4 x=0.55;

(52)8(x﹣6.2)=41.6 8(x﹣6.2)÷8=41.6÷8 x﹣6.2+6.2=5.2+6.2 x=11.4.

(53)0.5(x﹣0.5)=7.5 0.5(x﹣0.5)÷0.5=7.5÷0.5 x﹣0.5=15 x﹣0.5+0.5=15+0.5 x=15.5;

(54)(9x+1.5+7x)÷5=5.1 (16x+1.5)÷5=5.1 (16x+1.5)÷5×5=5.1×5

55)3x+7=29.5 3x+7﹣7=29.5﹣7 3x=22.5 3x÷3=22.5÷3 x=7.5 56)5x﹣2.8×1.2=1.04 5x﹣3.36=1.04 5x﹣3.36+3.36=1.04+3.36 5x=4.4 5x÷5=4.4÷5 x=0.88 57)4x+6x=28.5 10x=28.8 10x÷10=28.5÷10 x=2.85 58)2.38x+9.8=33.6 2.38x+9.8﹣9.8=33.6﹣9.8

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2.38x÷2.38=23.8÷2.38 x=10 (59)2(x﹣3)=10.6 2(x﹣3)÷2=10.6÷2 x﹣3+3=5.3+3 x=63.5;

(64)x﹣0.36x=3.2 0.64x=3.2 0.64x÷0.64=3.2÷0.64 x=8.3; (60)13x﹣x=14.4 12x=14.4 12x÷12=14.4÷12 x=1.2; (61)68﹣1.1x=24 68﹣1.1x+1.1x=24+1.1x 68﹣24=24+1.1x﹣24 44÷1.1=1.1x÷1.1 x=40.

(62)3(x+3.5)=21.6 3(x+3.5)÷3=21.6÷3 x+3.5﹣3.5=7.2﹣3.5 x=3.7;

(63)3x﹣54=136.5 3x﹣54+54=136.5+54 3x÷3=190.5÷3

x=5; 65)4x+2.8×4=19.32 4x+11.2﹣11.2=19.32﹣11.2 4x÷4=8.12÷4 x=2.03. 66)4x﹣5.2=5.2 4x﹣5.2+5.2=5.2+5.2 4x=10.4 4x÷4=10.4÷4 x=2.6; 67)4.8x+2.6x=3.7 7.4x=3.7 7.4x÷7.4=3.7÷7.4 x=0.5; 68)3x+6.4×2=50.3 3x+12.8=50.3

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3x+12.8﹣12.8=50.3﹣12.8 3x=37.5 3x÷3=37.5÷3 x=12.5. (69)2.7x﹣1.8=1.2x+2.7, (5.9+x)÷3+16﹣16=30﹣16, (5.9+x)÷3×3=14×3, 5.9+x﹣5.9=42﹣5.9, x=36.1. (73)0.56×5﹣4x=0.4, 2.7x﹣1.8+1.8=1.2x+2.7+1.8, 2.7x﹣1.2x=1.2x+4.5﹣1.2x, 1.5x÷1.5=4.5÷1.5, x=3;

(70)8﹣5(6x+0.7)=10x+0.5, 8﹣30x﹣3.5=10x+0.5, 4.5﹣30x+30x=10x+0.5+30x, 4.5﹣0.5=40x﹣0.5, 4÷40=40x÷40, x=0.1;

(71)7÷x﹣0.7=1.3, 7÷x﹣0.7+0.7=1.3+0.7, 7÷x×x=2×x, 7÷2=2x÷2, x=3.5;

(72)(5.9+x)÷3+16=30,

2.8﹣4x=0.4, 2.8﹣4x+4x=0.4+4x, 0.4+4x=2.8, 0.4+4x﹣0.4=2.8﹣0.4, 4x=2.4, 4x÷4=2.4÷4, x=0.6; 74)4(x﹣0.5)=9.6, 4x﹣2=9.6, 4x﹣2+2=9.6+2, 4x=11.6, 4x÷4=11.6÷4, x=2.9. 75)2×(x+1.7)=9.2 2×(x+1.7)÷2=9.2÷2 x+1.7=4.6 x+1.7﹣1.7=4.6﹣1.7 x=2.9.

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(76)8x﹣4x=0.64 4x=0.64 4x÷4=0.64÷4 x=0.16.

(77)2x﹣0.24=0.12 2x﹣0.24+0.24=0.12+0.24 2x=0.36 2x÷2=0.36÷2 x=0.18.

(78)(3.8﹣2)x=14.4 1.8x=14.4 1.8x÷1.8=14.4÷1.8 x=8. (79)64﹣16X=56.8

64﹣16X+16X=56.8+16X 16X+56.8=64 16X+56.8﹣56.8=64﹣56.8 16X=7.2 16X÷16=7.2÷16 X=0.45;

,.

(80)8.6X﹣2.6X=36.6 6X=36.6 6X÷6=36.6÷6 X=6.1;

(81)2.2(X+8)=22 2.2(X+8)÷2.2=22÷2.2 X+8=10 X+8﹣8=10﹣8 X=2;

(82)6×4﹣0.6X=6.36 24﹣0.6X=6.36 24﹣0.6X+0.6X=6.36+0.6X 0.6X+6.36=24 0.6X+6.36﹣6.36=24﹣6.36 0.6X=17.64 0.6X÷0.6=17.64÷0.6 X=29.4 (83)0.03×150﹣5x=3.2 4.5﹣5x=3.2, 4.5﹣5x+5x=3.2+5x, 4.5﹣3.2=3.2+5x﹣3.2, 1.3÷5=5x÷5,

x=0.26;

(84)45.3﹣4X=35.7, 45.3﹣4X+4X=35.7+4X, 35.7+4X=45.3, 35.7+4X﹣35.7=45.3﹣35.7, 4X=9.6, 4X÷4=9.6÷4, X=2.4;

(85)3(5.4+X)÷6=7.2, (3×5.4+3X)÷6×6=7.2×6, 16.2+3X=43.2, 16.2+3X﹣16.2=43.2﹣16.2, 3X=27, 3X÷3=27÷3, X=9;

(86)5.9X+7=8.7X, 5.9X+7﹣7=8.7X﹣7, 5.9X=8.7X﹣7, 5.9X﹣5.9X=8.7X﹣7﹣5.9X, 2.8X﹣7=0, 2.8X﹣7+7=0+7,

,.

2.8X=7, 2.8X÷2.8=7÷2.8, X=2.5. (87)3+0.6x=4.32 3+0.6x﹣3=4.32﹣3, 0.6x÷0.6=1.32÷0.6, x=2.2; (88)0.6(y﹣0.4)=6, 0.6(y﹣0.4)÷0.6=6÷0.6, y﹣0.4+0.4=10+0.4, y=10.4

小数方程计算专项练习进步题

,.x+2.5=13x+2.5﹣2.5=13﹣2.5x=11.5(42)2x﹣2+1.8=3.62x﹣0.2=3.6x=0.18;(46)6x+4x﹣11=32.910x﹣11+11=32.9+1110x÷10=43.9÷
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