錯誤
分析:此題應(yīng)先算除法,再算減法.而原題先算了減法,再算除法,故本題錯誤.
解答:
-
÷
,
=
-
×
,
=
-
,
=
.
故答案為:×.
點評:四則混合運(yùn)算,應(yīng)按運(yùn)算順序和運(yùn)算法則進(jìn)行計算.先算乘除,再算加減.
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活動樂園
在下面的等式中,添上運(yùn)算符號和括號,使等式成立.
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9.5×100= | 1.25×8 | 0.25×0.9×4= | 1.87×0= |
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0.35×2= | 2.9×0.3= | 10-0.9= | 5.67×0= |
0.8×0.01= | 2.5×0.2= | 2.4×0.3= | 1.6×0.25= |
0.17×0.3= | 15×0.01= | 10×0.07= | 0.7×0.05= |
0.2×0.05= | 7.8×0.01= | 0.2×0.26= | 0.04×4= |
12.4+2.1= | 0.08×0.5= | 0.14×4= | 9×2.5+9×1.5= |
1.8×0.5= | 2.3×5= | 0.3×3.6= | 8×0.9+8×2.1= |
2.5×4= | 0.8+2.7×2= | 0.05×7= | 4.8+2.1+7.9= |
3.4-1.8= | 2.5+0.2×2= | 0.02×0.1= | 5.4-2.8= |
0.3×0.2= | 3.5×2×0.1= | 0.3×0.3= | 0×10.3×2.2= |
0.12×0.7= | 0.2×0.5= | 0.92×0.4= | 6.7-1.43= |
1.2×4= | 1.3×2= | 1.2×0.3= | 4.6+5.08= |
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