下面各题,怎样算简便就怎样算. ①1080+270÷18-864 ②7.54+
下面各题,怎样算简便就怎样算.①1080+270÷18-864②7.54+127+2.46+167③(2.4-2320)÷0.625+45④2.5×12.5×40×0.8...
下面各题,怎样算简便就怎样算. ①1080+270÷18-864 ②7.54+ 12 7 +2.46+ 16 7 ③(2.4- 23 20 )÷0.625+ 4 5 ④2.5×12.5×40×0.8 ⑤98.9×99+98.9 ⑥40.5÷ 1 4 ×[(1- 1 4 )×1.2].
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①1080+270÷18-864 =1080+15-864, =231; ②7.54+
=(7.54+2.46)+(
=10+4, =14; ③(2.4-
=(2.4-1.15)÷0.625+0.8, =1.25÷0.625+0.8, =2+0.8, =2.8; ④2.5×12.5×40×0.8 =(2.5×40)×(12.5×0.8), =100+10, =110; ⑤98.9×99+98.9 =(99+1)×98.9, =100×98.9, =9890; ⑥40.5÷
=40.5÷
=40.5×4×0.9, =145.8. |
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