口算.
1.8×0.5= 49×0.2= 10÷2.5= 0.83÷0.1= 2.4﹣0.8=
0.44÷2.2= 0.6×0.5= 0.4+0.15= 1.25×8= 0.56÷8=
12.5×18.5×0.8= 5.38+0.45+1.55= 0.42÷0.7÷0.6= 0.74×0.6+0.74×0.4=
计算:
①3×(x+9)=27
②16×8﹣7x=23
③7.5﹣7.5×0.5﹣2.6×0.8
④13.7×6.5+5.9×13.7﹣12.4×3.7
⑤50×[(0.2+4.8﹣4.8+0.2)÷2]
⑥11.25+21.25+31.25+41.25+51.25+61.25+71.25+81.25.
32÷4+2.5÷2.8
(1.75×3+1.75)×2.5
0.1×0.1÷(0.2+0.1﹣0.2+0.1)
0.08×2.7+0.08×6.3+0.08
(4.6÷0.2+0.8)×1.02
[(1.2﹣0.78)÷0.12+0.65]×0.8.
试题篮
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