脱式计算(能简算的要简算)①31315-21314+5215-1114②14.85-1.58×8+31.2÷1.2③(113+212)÷(2-112)④2.25×35+2.75÷123+60%⑤9.81×0.1+0.5×98.1+0.049×981⑥1000+999-998-9-数学
题文
脱式计算(能简算的要简算) ①3
②14.85-1.58×8+31.2÷1.2 ③(1
④2.25×
⑤9.81×0.1+0.5×98.1+0.049×981 ⑥1000+999-998-997+996+995-994-993+…+104+103-102-101. |
答案
①3
=(3
=9-4, =5; ②14.85-1.58×8+31.2÷1.2, =14.85-12.64+26, =2.21+26, =28.21; ③(1
=
=7
④2.25×
=2.25×
|