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简算练习(2)

简算练习(2)
简算练习(2)

一、口算。(10分)

10-2.65= 0÷3.8=9×0.08= 24÷0.4=

67.5+0.25=6+14.4=0.77+0.33=

5-1.4-1.6=80×0.125=

二、用简便方法计算下面各题。

1125-997 998+1246 4 +3.2+5 +6.8

12 -(1 +2 ) 400÷125÷8 125×8.8

4.35+4.25+3.65+3.75 3.4×99+3.4

17.15-8.47-1.53 0.125×0.25×32

22.3-2.45-5.3-4.55 187.7×11-187.7

3415 ×(57 -314 ÷34 ) 212 ×6.6+2.5×635 1178 -613 -123 4.6+325 +635 +5.4

2.8+549 +7.2+359 445 -(245 +512 )

438 +2.25+558 +734 725 +457 +235 53611 -1647 +16511 0.75+58 +14 +0.375

5-21417 -1317 45 +945 +9945 +99945 +999945 48.3-1516 -456 956 ×4.25+414 ÷6

0.625×0.5+58 +12 ×62.5% 3138 ×72513 ÷3138 1645 +(247 -1.8) 2.5×(910 +910 +910 +910 )

22×34 +25×75%-7×0.75 (111+999) ÷[56×(37 -38 )]

0.25×63.5-14 ×1312 6715 ×2.5-212 ×4715

389 +3.125+119 +178 1125-996

49.5×1035 -(50-12 )×0.6 71×99

711 ×41419 +5519 ÷147 +711 8439+1001

897×38 -37.5%+104×0.375 314 ×(538 -5.375)

3.5×114 +1.25×2710 +3.8÷45 299×101

72×156-56×72 25×32×125 709×99+709

0.25×48 2.5×37 563×999 212×6.6+2.5×635 75.3×99+75.3 4.6×3.7+54×0.37

0.125×34+18×8.25+12.5% 15314―4.25―534

8.37-3.25-(1.37+1.75) 9.63÷2.5÷4

2100÷20 1178―613―123

19.82―6.57―3.43 4.6+325+635+5.4

438+2.25+558+734 35 ×153 – 0.6×53

10 - 719 - 1219 + 119 25×13 ÷52 ×310

13.09-8.12-4.88 12×103-4500÷75

18 ×[12 ÷(35 ×109 )] (215 +311 )×15×11

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