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6.8÷0.5 4.2÷0.25 2.1÷0.2 1.9÷0.1 6.8×2 4.2×4 2.1X

0.25x(4x1.2)+1.25x(8÷0·5) =0.25x4x1.2+1.25x8÷0.5 =1.2+10x2 =1.2+20 =21.2

可以,1.1x2.1x0.5÷4.2=1.1x0.5x(2.1÷4.2)=1.1x0.5x0.5=(1+0.1)1x(0.5x0.5) =(1+0.1)x0.25=0.25+0.025=0.275

解:(0.4x+2.1)÷0.5=(0.5-0.2x)÷0.03+0.6,等式两边同乘以1.5,等式不变 即:(0.4x+2.1)*3=(0.5-0.2x)*50+0.9 解之得:x=1.75

(1)5.4+2x=8.6, 5.4+2x-5.4=8.6-5.4, 2x=3.2, 2x÷2=3.2÷2, x=1.6;(2)2.5:5=x:8, 5x=2.5×8, 5x=20, 5x÷5=20÷5, x=4;(3)0.2=1-x24, 0.2+x24=1-x24+x24, 0.2+x24=1,0.2-0.2+x24=1-0.2, x24=0.8, x=0.8×24, x=19.2;(4)34...

10.1+0.9=115.2×0.5=2.60.25×8=20.7×0.7=0.494.62-2.52=2.11.8x-x=0.8x3.6÷1.8=20.2÷4=0.0512-2.9-4.1=51÷0.1÷0.2=503.6÷1.8=20.2÷4=0.05

0.6x+0.3×4=4.2 0.6x+1.2=4.2 0.6x=3 x=5

1. 1.2÷0.5÷0.4=1.2(÷)(0.5(x)0.4) 2. 5.4÷(0.9X0.3)=5.4(÷)0.9(÷)0.3 3. 3.5÷1.4=3.5(÷)0.7(÷)2

0.65×4=2.6;0.99÷3=3.3;1÷4=0.25;4.2÷3=1.4;1-0.2÷0.2=0;10x-7.8x=2.2x;23.1×0.1=2.31;9.1÷7=1.3;2.5×4×12=120;1.05×100=105;0×3.75a=0;3.5×4=14.

0.4×3=1.2, 4.35×100=435, 3.5x+x=4.5x, 0.72÷0.9=0.8, 9.85×0=0, 40×0.1=4, 32x-4x=28x, 7.2÷6=1.2, 0.25×4=1, 1×0.05=0.05, 17a-5a=12a, 7.82÷1=7.82, 0.125×8=1, 99×3.2+6.8=323.6, a-0.2a=0.8a, 0.34÷0.17=2, 4.3×2=8.6, ...

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