专项4:根算式中规律直接较
11.字母表示数量关系
7214 8×282
15+15152 x×xx2
3×t3t 1×a×aa2
12.加法运算律减法运算性质
76+8989+76
128+43+57128+(43+57)
240-56-44240-(56+44)
178-(78+25)178-78+25
13.法运算律法运算性质
24×5050×24
25×7×428×26
36×124×12×9
72÷3÷472÷(3×4)
125×24125×8×3
15×(9-4)15×9-15×4
14.名数改写
483千克 4千克83克 036千米 365米
26方分米026方米
438米4米3分米8厘米
15.数加减法
085+064085+098
48+025983-283
134-371968-371
371+2269-542
69-5469-532
16.数加减混合运算
132-327-1415135
1067-515+43298
569+142-169542
专项5:脱式计算
17.加法运算律
472+51+29 246+79+121
313+61+87+239
18.法运算律
2×137×5 28×159-28×59
32×(200+3) 38×39+38
19.减法法运算性质
708-124-76 563-497
618-(352-282) 540÷45
5600÷25÷4
20.数加减混合运算
46-128+309
5647+(3525-284)
21.数简便运算
273+732+727
585-175-025
15047+892-5047
126-328+74-572
答案
11.> < < = = = 12= = = <
13.= < = = = = 14> < = =
15.< < > > < 16< > =
17. 472+51+29 246+79+121
=472+(51+29) =246+(79+121)
=472+80 =246+200
=552 =446
313+61+87+239
=(313+87)+(61+239)
=400+300
=700
18. 2×137×5 28×159-28×59
=2×5×137 =28×(159-59)
=10×137 =28×100
=1370 =2800
32×(200+3) 38×39+38
=32×200+32×3 =38×(39+1)
=6400+96 =38×40
=6496 =1520
19. 708-124-76 563-497
=708-(124+76) =563-(500-3)
=708-200 =563-500+3
=508 =66
618-(352-282) 540÷45
=618-352+282 =540÷(9×5)
=618+282-352 =540÷9÷5
=900-352 =60÷5
=548 =12
5600÷25÷4
=5600÷(25×4)
=5600÷100
=56
20. 46-128+309
=332+309
=641
5647+(3525-284)
=5647+685
=6332
21. 273+732+727
=273+727+732
=100+732
=1732
585-175-025
=585-(175+025)
=585-2
=385
15047+892-5047
=15047-5047+892
=10+892
=1892
126-328+74-572
=(126+74)-(328+572)
=20-9
=11
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