脱式计算(能简算的要简算) 14.85﹣1.58×8+31.2÷1.2 9.81×0.1+0.5×98.1+0.049×981 1000+999﹣998﹣997+996+995﹣994﹣993+…+104+103﹣102﹣101.
80÷x=2012x+8x-12=28 (2x-1)+10=371.6x+3.4x-x-5=27 (3x+5)÷2=(5x-9)÷3x-21×=4x÷=÷
3x+7x+10=903(x-12)+23=35 7x-8=2x+275x-18=3–2x
x+4=10 x-12=348x=96 4x-30=08.3x-2x=63x÷10=5.2
(x- 4.5)=7x-25%x=10
3x=5(32-x)0.36×5-x=