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The second volume of the fourth grade is an excellent way to guide mathematics learning.
1 1 768 384 4608 bit 6 times 128 ten bit 3 times128 2 489014105 996 3 776165438 6544. 112×14 =1568 people 21400 48 660 480 4000 480 990 2800 2 5928 84161. 5, 128× 15= 1920; 198× 15=2970; 2 1 8×.1000 4400 8400 4000018000 3900 4800 4200 2, ellipsis 3,13600 9720 36400 25200 4320 6000 4, 2440. 20×13 =103 350× 20 = 7500 kg =7.5 tons 7.5 tons >: 5 tons less than 5,90× 8× 30 = 21600 m71640 280 660. 22950 1 1040 3, 87361128 660 6300 4150 7260 6930 4955 5, (1) 480×/kloc

2. 630 1000 4900 3, 440× 25 =1000 kg = 1 1 ton 4, (1) 26× 20+40× & lt& gt2, 2438 1 1340 23800 3, (1)165×12 =1980 yuan (2) 800×/kloc. 203×26=5278 10 1, the third 2, 1 3 4 3, slightly 1 1, slightly 2,5123,5 liters and 20 liters/kloc. Salad oil cola refrigerator rice cooker, etc. 12 1, choose the second group 2,15ml150ml 3,2000480006100094,250ml× 4 =100ml×/. 200ml 250ml 300ml 655& gt& lt& lt= = 3, 2, 3, 5, 4 bottles, water 150 ml milk 300 ml 5, Mengniu Zhiduoxing milk 190 ml hero ink 60 ml Rejoice shampoo 400 ml, etc. 14 1, 200 ml 500 ml 2.5 l 20 l 2, = ><& lt3, milliliter liter milliliter 4, omitted 15 1 21000 840 56000 20000 3700 960 8400 4800 8800 2,1-42-33-2.

2, (1) can (2) can (3) can't (4) can't 3, slightly 4, slightly 5, slightly 17 1, 5472 4466 20700 2, slightly 3, (1) slightly (. More than 3cm but less than 13cm 18 1, (1) acute angle right angle (2) acute angle right angle 2, slightly 3, obtuse angle right angle 4, slightly 19 1, acute angle triangle 24 right triangle/kloc. Diagonal diagonal height 3, connecting upper left and lower right, connecting lower left and upper right 4, drawing height 20 1, 10 90 degrees 70 degrees 2, (1)90-degree right triangle (2)70-degree acute triangle 3, 45 degrees 36 degrees 55 degrees 15 degrees 4. (65 acute triangle right triangle acute triangle 3, (1) right angle 360 degrees (2) 180 degrees 4, (65438)666( 1)664(2)446 2, (1)70 degrees is (. 70 70 40 degrees 55 55 70 degrees 45 45 90 degrees 65 50 degrees 23 1) 90-degree right triangle (2) acute triangle 2, 80 degrees 45 degrees 70 degrees 90 degrees 30 degrees 3 1)