÷0.04=400÷125÷8=1.9×4×0.5=5-1.4-1.6=80×0.125=3.2×7÷3.2×7=÷3×=÷6=-(+)=×2=187.7×11-187.7=(-)×12=1-÷62.5%=二、写出下列每题在简便运算时所运用的定律或性质+3.2++6.825×(8×0.4)×1.25-(-)()()()(++)×724÷÷16÷()()()三、用简便方法计算。1125-997998+1246+9989 (8700+870+87)÷87125×8.81.3+4.25+3.7+3.7517.15-(3.5-2.85) 计算训练(二)【简便计算】3.4×99+3.44.8×1.010.4×(2.5÷73) (1.6+1.6+1.6+1.6)×25(+-)÷12.3-2.45-5.7-4.55÷+×0.125×0.25×64 64.2×87+64.2×13×17+×825÷100×+0.125×+0.578×36+7.8×641-7.8计算训练(三)【简便计算】(54+)÷9276×÷27.69.25×9.9+92.5%5.48+8.73+4.52+1.279.7÷1.25÷0.80.4×1.25×25×8.5-4.25-5.750.125×0.25×32(++)÷(+)×20++-(-)(6.3-6.3×0.9)÷6.3计算专题训练(四)脱式计算 91-91÷13 6÷0.5×41-0.125÷1/8 (5/8+1/2)÷25%用简便方法计算。4.2-1.8+0.8 8.4×0.26+0.7431.7-0.5×0.7-1.655.5×17.3+6.7×5.5118÷25 4.2×97+12.6解方程7-2×9=80 7+5=4213-7.5=18.①125与它的1/5的差是多少? ②一个数的1/4比2.8多1.2,求这个数?
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