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