遞等式計算遞等式計算:17.8+6.3÷(3.2减1.6)

遞等式計算遞等式計算:17.8+6.3÷(3.2减1.6)


17.8+6.3÷(3.2-1.6)
=17.8+6.3÷1.6
≈17.8+3.94
≈21.74



43.3*76+111*19.2+455*7.6簡便


43.3*76+111*19.2+455*7.6
=433*7.6+455*7.6+111*19.2
=7.6*(433+455)+111*19.2
=7.6*888+111*19.2
=111*(7.6*8+19.2)
=111*80
=8880



455*7.6+43.3+111*19.2簡算


原式=(444+11)*7.6+(444-11)*0.1+111*19.2
=111*4*7.6+11*7.6+111*4*0.1-11*0.1+111*19.2
=111(4*7.6+4*0.1+19.2)+11(7.6-0.1)
=111(4*7.6+4*0.1+19.2)+11*7.5
=111(4*7.6+4*0.1+4*4.8)+11*(8-0.5)
=111*4*(7.6+0.1+4.8)+11*8-11*0.5
=111*4*12.5+11*8-11*0.5
=111*50+11*8-11*0.5
=5550+88-5.5=5638-5.5=5632.5