5.解方程.
7x+23=128 | 9x-5.4x=0.72 | 27-17x=13.4(检验) |
6x-7.2×2=3.96 | (x-3.8)÷5=13 | 3×(21÷0.7x)=18 |
4.直接写得数.
3a+7a= | 3.6t-2.5t= | 6x+3x-5x= | 9.6÷0.6= |
0.86-0.4= | 0.25×0.12= | 4.05-2.17-1.83= | 5.31÷1.25÷8= |
3.下面( )不是方程.
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A. | 3x+16=50 | B. | 2x-6 | C. | A+2b=16 |