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$2×140= $
$140÷2= $
$660÷6= $
$7×800= $
$7×700= $
$840÷2= $
$430×2= $
$310×3= $
$130×3= $
$134+56= $
$1500-900= $
$1800-800= $
$363÷3= $
$126+457= $
$800÷8= $
$3500÷20= $
$1600÷16= $
$1200÷60= $
$1600÷8= $
$1200÷40= $
$5600÷70= $
$140÷2= $
$660÷6= $
$7×800= $
$7×700= $
$840÷2= $
$430×2= $
$310×3= $
$130×3= $
$134+56= $
$1500-900= $
$1800-800= $
$363÷3= $
$126+457= $
$800÷8= $
$3500÷20= $
$1600÷16= $
$1200÷60= $
$1600÷8= $
$1200÷40= $
$5600÷70= $
答案
解析：
这些题目都是基础的数学运算题目，包括乘法、除法、加法和减法。针对这些题目，学生需要熟练掌握基本的四则运算规则，并能够准确地进行计算。
答案：
$2 × 140 = 280$
$140 ÷ 2 = 70$
$660 ÷ 6 = 110$
$7 × 800 = 5600$
$7 × 700 = 4900$
$840 ÷ 2 = 420$
$430 × 2 = 860$
$310 × 3 = 930$
$130 × 3 = 390$
$134 + 56 = 190$
$1500 - 900 = 600$
$1800 - 800 = 1000$
$363 ÷ 3 = 121$
$126 + 457 = 583$
$800 ÷ 8 = 100$
$3500 ÷ 20 = 175$
$1600 ÷ 16 = 100$
$1200 ÷ 60 = 20$
$1600 ÷ 8 = 200$
$1200 ÷ 40 = 30$
$5600 ÷ 70 = 80$
这些题目都是基础的数学运算题目，包括乘法、除法、加法和减法。针对这些题目，学生需要熟练掌握基本的四则运算规则，并能够准确地进行计算。
答案：
$2 × 140 = 280$
$140 ÷ 2 = 70$
$660 ÷ 6 = 110$
$7 × 800 = 5600$
$7 × 700 = 4900$
$840 ÷ 2 = 420$
$430 × 2 = 860$
$310 × 3 = 930$
$130 × 3 = 390$
$134 + 56 = 190$
$1500 - 900 = 600$
$1800 - 800 = 1000$
$363 ÷ 3 = 121$
$126 + 457 = 583$
$800 ÷ 8 = 100$
$3500 ÷ 20 = 175$
$1600 ÷ 16 = 100$
$1200 ÷ 60 = 20$
$1600 ÷ 8 = 200$
$1200 ÷ 40 = 30$
$5600 ÷ 70 = 80$
40 × 180 =
7200
108 × 90 = 9720
106 × 50 = 5300
125 × 8 ÷ 10 = 100
25 × 4 ÷ 10 = 10
36 ÷ 9 + 1200 = 1204
3600 ÷ 36 = 100
312 ÷ 2 + 321 = 477
3600 ÷ 900 + 10 = 14
(360 - 300) ÷ 30 = 2
800 × (4 - 3) = 800
100 ÷ 50 × 2 = 4
540 ÷ 90 = 6
6 × 300 + 4 = 1804
810 ÷ 90 = 9
500 + 7 × 3 = 521
30 + 360 ÷ 60 = 36
8 × 2 + 800 ÷ 4 = 216
1500 ÷ 50 × 12 = 360
505 ÷ 5 × 7 = 707
(960 - 60) ÷ 3 = 300
答案
解析：这些题目主要考查了基础的数学运算能力，包括乘法、除法、加法和减法等基本运算，以及运算的优先级。
答案：
$40 × 180 = 7200$
$108 × 90 = 9720$
$106 × 50 = 5300$
$125 × 8 ÷ 10 = 100$
$25 × 4 ÷ 10 = 10$
$36 ÷ 9 + 1200 = 1204$
$3600 ÷ 36 = 100$
$312 ÷ 2 + 321 = 477$
$3600 ÷ 900 + 10 = 14$
$(360 - 300) ÷ 30 = 2$
$800 × (4 - 3) = 800$
$100 ÷ 50 × 2 = 4$
$540 ÷ 90 = 6$
$6 × 300 + 4 = 1804$
$810 ÷ 90 = 9$
$500 + 7 × 3 = 521$
$30 + 360 ÷ 60 = 36$
$8 × 2 + 800 ÷ 4 = 216$
$1500 ÷ 50 × 12 = 360$
$505 ÷ 5 × 7 = 707$
$(960 - 60) ÷ 3 = 300$
答案：
$40 × 180 = 7200$
$108 × 90 = 9720$
$106 × 50 = 5300$
$125 × 8 ÷ 10 = 100$
$25 × 4 ÷ 10 = 10$
$36 ÷ 9 + 1200 = 1204$
$3600 ÷ 36 = 100$
$312 ÷ 2 + 321 = 477$
$3600 ÷ 900 + 10 = 14$
$(360 - 300) ÷ 30 = 2$
$800 × (4 - 3) = 800$
$100 ÷ 50 × 2 = 4$
$540 ÷ 90 = 6$
$6 × 300 + 4 = 1804$
$810 ÷ 90 = 9$
$500 + 7 × 3 = 521$
$30 + 360 ÷ 60 = 36$
$8 × 2 + 800 ÷ 4 = 216$
$1500 ÷ 50 × 12 = 360$
$505 ÷ 5 × 7 = 707$
$(960 - 60) ÷ 3 = 300$
12 × 800 =
9600
906 × 7 = 6342
705 ÷ 5 = 141
70 × 900 = 63000
3600 ÷ 90 + 9 = 49
450 ÷ 90 - 5 = 0
1500 ÷ 50 + 12 = 42
3600 ÷ 90 + 100 = 140
630 ÷ 30 - 14 = 7
350 ÷ 70 + 70 = 75
8100 ÷ 90 + 81 = 171
300 ÷ 30 + 300 = 310
3150 ÷ 30 = 105
505 ÷ 5 + 26 = 127
1800 ÷ 90 + 45 = 65
650 ÷ 5 + 150 = 280
375 ÷ 5 + 100 = 175
202 + 7 × 7 = 251
72 + 819 ÷ 9 = 163
630 ÷ (30 ÷ 1) = 21
500 × 7 × 3 = 10500
答案
解析：这些题目主要考查了基础的数学运算能力，包括乘法、除法、加法和减法，以及这些运算的组合。
答案：
$12× 800 = 9600$
$906 × 7 = 6342$
$705 ÷ 5 = 141$
$70 × 900 = 63000$
$3600 ÷ 90 + 9 = 40 + 9 = 49$
$450 ÷ 90 - 5 = 5 - 5 = 0$
$1500 ÷ 50 + 12 = 30 + 12 = 42$
$3600 ÷ 90 + 100 = 40 + 100 = 140$
$630 ÷ 30 - 14 = 21 - 14 = 7$
$350 ÷ 70 + 70 = 5 + 70 = 75$
$8100 ÷ 90 + 81 = 90 + 81 = 171$
$300 ÷ 30 + 300 = 10 + 300 = 310$
$3150 ÷ 30 = 105$
$505 ÷ 5 + 26 = 101 + 26 = 127$
$1800 ÷ 90 + 45 = 20 + 45 = 65$
$650 ÷ 5 + 150 = 130 + 150 = 280$
$375 ÷ 5 + 100 = 75 + 100 = 175$
$202 + 7 × 7 = 202 + 49 = 251$
$72 + 819 ÷ 9 = 72 + 91 = 163$
$630 ÷ (30 ÷ 1) = 630 ÷ 30 = 21$
$500 × 7 × 3 = 3500 × 3 = 10500$
答案：
$12× 800 = 9600$
$906 × 7 = 6342$
$705 ÷ 5 = 141$
$70 × 900 = 63000$
$3600 ÷ 90 + 9 = 40 + 9 = 49$
$450 ÷ 90 - 5 = 5 - 5 = 0$
$1500 ÷ 50 + 12 = 30 + 12 = 42$
$3600 ÷ 90 + 100 = 40 + 100 = 140$
$630 ÷ 30 - 14 = 21 - 14 = 7$
$350 ÷ 70 + 70 = 5 + 70 = 75$
$8100 ÷ 90 + 81 = 90 + 81 = 171$
$300 ÷ 30 + 300 = 10 + 300 = 310$
$3150 ÷ 30 = 105$
$505 ÷ 5 + 26 = 101 + 26 = 127$
$1800 ÷ 90 + 45 = 20 + 45 = 65$
$650 ÷ 5 + 150 = 130 + 150 = 280$
$375 ÷ 5 + 100 = 75 + 100 = 175$
$202 + 7 × 7 = 202 + 49 = 251$
$72 + 819 ÷ 9 = 72 + 91 = 163$
$630 ÷ (30 ÷ 1) = 630 ÷ 30 = 21$
$500 × 7 × 3 = 3500 × 3 = 10500$
