640 + 34 = 88 + 120 = 770 - 70 = 420 + 28 =
258 + 47 = 520 + 62 = 140 - 36 = 500 - 45 =
30 + 280 = 940 + 60 = 450 - 360 = 360 - 270 =
258 + 47 = 520 + 62 = 140 - 36 = 500 - 45 =
30 + 280 = 940 + 60 = 450 - 360 = 360 - 270 =
答案:
674 208 700 448
@@305 582 104 455
@@310 1000 90 90
@@305 582 104 455
@@310 1000 90 90
1. 计算下面各题。
360 - 90 - 110 - 28 540 - 85 - 107 - 30 90 + 125 + 47 + 110
45×99 + 45 3500÷25÷2 24 + 49×24
360 - 90 - 110 - 28 540 - 85 - 107 - 30 90 + 125 + 47 + 110
45×99 + 45 3500÷25÷2 24 + 49×24
答案:
132 318 372 4500 70 1200
2. 求出下面图形中各个未知角的度数。

答案:
$360^{\circ}-90^{\circ}-90^{\circ}-128^{\circ}=52^{\circ}$ $360^{\circ}-127^{\circ}-53^{\circ}-127^{\circ}=53^{\circ}$
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