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3.6x十x二36.8

3.6x+x=36.8 解:4.6x=36.8 x=8

(1)4x+8=36, 4x+8-8=36-8, 4x=28, 4x÷4=28÷4, x=7;(2)x÷5.6=3, x=3×5.6, x=16.8;(3)3.6x-x=9.75, 2.6x=9.75, 2.6x÷2.6=9.75÷2.6, x=3.75;(4)4(x-3)=23.2, 4×(x-3)÷4=23.2÷4, x-3=5.8, x-3+3=5.8+3, x=8.8;

3.64x0.8+6.36x0.8-3.8 =(3.64+6.36)x0.8-3.8 =10x0.8-3.8 =8-3.8 =4.2

3.6x0.8+1.6x0.36 =0.36×8+1.6×0.36 =0.36×(8+1.6) =0.36×9.6 =0.36×(10-0.4) =0.36×10-0.36×0.4 =3.6-0.144 =3.456

127.8×36+22×3.6-13x260 =127.8x36+2.2x36-13x260 =(127.8+2.2)x36-13x260 =130x36-130x26 =130x(36-26) =1300

8.7x3.6+13x0.36 =8.7x3.6+1.3x3.6 =(8.7+1.3)x3.6 =10x3.6 =36 5.8x3.65 =2.9×7.3 =(3-0.1)×7.3 =3×7.3-0.1×7.3 =21.9-0.73 =21.17 9.7x(5.83-2.64) =9.7x3.19 =(10-0.3)×3.19 =10×3.19-0.3×3.19 =31.9-0.957 =30.943

x-0.7ⅹ=3.6 0.3x=3.6 x=3.6÷0.3 x=12

9.875-(3又8分之7-75%)+3又4分之1 =9.875-3又8分之7+75%+3又4分之1 =6+4 =10

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