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$420+390=$
$520-380=$
$700×300=$
$5400÷20=$
$240+720=$
$920-660=$
$12×200=$
$9900÷90=$
$40+570=$
$980-260=$
$12×800=$
$960÷60=$
$360+290=$
$280-90=$
$130×70=$
$750÷30=$
$190×30=$
$700÷50=$
$240×40=$
$960÷80=$
$480÷40=$
810
$520-380=$
140
$700×300=$
210000
$5400÷20=$
270
$240+720=$
960
$920-660=$
260
$12×200=$
2400
$9900÷90=$
110
$40+570=$
610
$980-260=$
720
$12×800=$
9600
$960÷60=$
16
$360+290=$
650
$280-90=$
190
$130×70=$
9100
$750÷30=$
25
$190×30=$
5700
$700÷50=$
14
$240×40=$
9600
$960÷80=$
12
$480÷40=$
12
答案
解析：这些题目都是基础的数学运算题目，包括加法、减法、乘法和除法。
答案：
$420 + 390 = 810$
$520 - 380 = 140$
$700 × 300 = 210000$
$5400 ÷ 20 = 270$
$240 + 720 = 960$
$920 - 660 = 260$
$12 × 200 = 2400$
$9900 ÷ 90 = 110$
$40 + 570 = 610$
$980 - 260 = 720$
$12 × 800 = 9600$
$960 ÷ 60 = 16$
$360 + 290 = 650$
$280 - 90 = 190$
$130 × 70 = 9100$
$750 ÷ 30 = 25$
$190 × 30 = 5700$
$700 ÷ 50 = 14$
$240 × 40 = 9600$
$960 ÷ 80 = 12$
$480 ÷ 40 = 12$
答案：
$420 + 390 = 810$
$520 - 380 = 140$
$700 × 300 = 210000$
$5400 ÷ 20 = 270$
$240 + 720 = 960$
$920 - 660 = 260$
$12 × 200 = 2400$
$9900 ÷ 90 = 110$
$40 + 570 = 610$
$980 - 260 = 720$
$12 × 800 = 9600$
$960 ÷ 60 = 16$
$360 + 290 = 650$
$280 - 90 = 190$
$130 × 70 = 9100$
$750 ÷ 30 = 25$
$190 × 30 = 5700$
$700 ÷ 50 = 14$
$240 × 40 = 9600$
$960 ÷ 80 = 12$
$480 ÷ 40 = 12$
$1000÷20=
$43×200=
$600-340=
$80+240=
$7200÷60=
$14×700=
$430-50=
$130+670=
$750÷50=
$200×37=
$890-560=
$730+190=
$3000÷50=
$17×400=
$540-360=
$670+330=
$5000÷20=
$180×50=
$18×500=
$270×30=
$980÷70=
50
$$43×200=
8600
$$600-340=
260
$$80+240=
320
$$7200÷60=
120
$$14×700=
9800
$$430-50=
380
$$130+670=
800
$$750÷50=
15
$$200×37=
7400
$$890-560=
330
$$730+190=
920
$$3000÷50=
60
$$17×400=
6800
$$540-360=
180
$$670+330=
1000
$$5000÷20=
250
$$180×50=
9000
$$18×500=
9000
$$270×30=
8100
$$980÷70=
14
$答案
解析：
这些题目都是基础的数学运算题目，包括除法、乘法和加减法。我们可以直接进行计算。
答案：
$1000 ÷ 20 = 50$；
$43 × 200 = 8600$；
$600 - 340 = 260$；
$80 + 240 = 320$；
$7200 ÷ 60 = 120$；
$14 × 700 = 9800$；
$430 - 50 = 380$；
$130 + 670 = 800$；
$750 ÷ 50 = 15$；
$200 × 37 = 7400$；
$890 - 560 = 330$；
$730 + 190 = 920$；
$3000 ÷ 50 = 60$；
$17 × 400 = 6800$；
$540 - 360 = 180$；
$670 + 330 = 1000$；
$5000 ÷ 20 = 250$；
$180 × 50 = 9000$；
$18 × 500 = 9000$；
$270 × 30 = 8100$；
$980 ÷ 70 = 14$。
这些题目都是基础的数学运算题目，包括除法、乘法和加减法。我们可以直接进行计算。
答案：
$1000 ÷ 20 = 50$；
$43 × 200 = 8600$；
$600 - 340 = 260$；
$80 + 240 = 320$；
$7200 ÷ 60 = 120$；
$14 × 700 = 9800$；
$430 - 50 = 380$；
$130 + 670 = 800$；
$750 ÷ 50 = 15$；
$200 × 37 = 7400$；
$890 - 560 = 330$；
$730 + 190 = 920$；
$3000 ÷ 50 = 60$；
$17 × 400 = 6800$；
$540 - 360 = 180$；
$670 + 330 = 1000$；
$5000 ÷ 20 = 250$；
$180 × 50 = 9000$；
$18 × 500 = 9000$；
$270 × 30 = 8100$；
$980 ÷ 70 = 14$。
$8.4-0.4=$
$8.4-4=$
$20.1-16.7=$
$12.1-0.9=$
$39.4+0.5=$
$19.8-9.5=$
$13.5+6.5=$
$16.7-8.9=$
$16.7+8.9=$
$14.7+14.7=$
$5.9+3.2=$
$3.2-2.7=$
$40.1+4.1=$
$40.1-4.1=$
$100-9.2=$
$22.3+3.8=$
$1.5+8.5=$
$7+2.6=$
$3.2+2.9=$
$10-0.9=$
$3.2+7.9=$
8
$8.4-4=$
4.4
$20.1-16.7=$
3.4
$12.1-0.9=$
11.2
$39.4+0.5=$
39.9
$19.8-9.5=$
10.3
$13.5+6.5=$
20
$16.7-8.9=$
7.8
$16.7+8.9=$
25.6
$14.7+14.7=$
29.4
$5.9+3.2=$
9.1
$3.2-2.7=$
0.5
$40.1+4.1=$
44.2
$40.1-4.1=$
36
$100-9.2=$
90.8
$22.3+3.8=$
26.1
$1.5+8.5=$
10
$7+2.6=$
9.6
$3.2+2.9=$
6.1
$10-0.9=$
9.1
$3.2+7.9=$
11.1
答案
8.4-0.4=8
8.4-4=4.4
20.1-16.7=3.4
12.1-0.9=11.2
39.4+0.5=39.9
19.8-9.5=10.3
13.5+6.5=20
16.7-8.9=7.8
16.7+8.9=25.6
14.7+14.7=29.4
5.9+3.2=9.1
3.2-2.7=0.5
40.1+4.1=44.2
40.1-4.1=36
100-9.2=90.8
22.3+3.8=26.1
1.5+8.5=10
7+2.6=9.6
3.2+2.9=6.1
10-0.9=9.1
3.2+7.9=11.1
8.4-4=4.4
20.1-16.7=3.4
12.1-0.9=11.2
39.4+0.5=39.9
19.8-9.5=10.3
13.5+6.5=20
16.7-8.9=7.8
16.7+8.9=25.6
14.7+14.7=29.4
5.9+3.2=9.1
3.2-2.7=0.5
40.1+4.1=44.2
40.1-4.1=36
100-9.2=90.8
22.3+3.8=26.1
1.5+8.5=10
7+2.6=9.6
3.2+2.9=6.1
10-0.9=9.1
3.2+7.9=11.1
