小数混合运算计算题

1．老师在黑板上写了13个自然数,让小王计算平均数（保留两位小数）,小王计算出的答案上12.43.老师说最后一位数字错了,其他的数字都对.请问正确的答案应该是________.　　2．老王的体重的2/

我说了哈!8.76+2.43+7.572.5×8＋12.5×425×0.321.93+2.7+2.07+7.30.56×99+0.561.2×2.5×4(0.25+2.5+25)×0.412.5＋5×

1.125*3+125*5+25*3+252.9999*3+101*11*(101-92)3.(23/4-3/4)*(3*6+2)4.3/7×49/9-4/35.8/9×15/36+1/276.12×

我认为这样太麻烦费眼就这么多1.3/7×49/9-4/32.8/9×15/36+1/273.12×5/6–2/9×34.8×5/4+1/45.6÷3/8–3/8÷66.4/7×5/9+3/7×5/97

(一)计算题:(1)(-4)(+6)(-7)(2)(-27)(-25)(-3)(-4)(3)0.001*(-0.1)*(1.1)(4)24*(-5/4)*(-12/15)*(-0.12)(5)(-3/

1.6-26.430969-6

3/7×49/9-4/38/9×15/36+1/2712×5/6–2/9×38×5/4+1/46÷3/8–3/8÷64/7×5/9+3/7×5/95/2-（3/2+4/5）7/8+（1/8+1/9）9

45×2/3+1/3×1527.7/19+12/19×5/628.1/4+3/4÷2/329.8/7×21/16+1/230.101×1/5–1/5×2131.50＋160÷40（58+370）÷（6

（1）原式=1-0.5×0.2×3.75=1-0.375=0.625（2）原式=-1-1/2×1/3×（2-9）=1-1/6×（-7）=1+7/6=13/6再问：（2）一开始不是-1吗到后面怎么变成1

.3/7×49/9-4/32.8/9×15/36+1/273.12×5/6–2/9×34.8×5/4+1/45.6÷3/8–3/8÷66.4/7×5/9+3/7×5/97.5/2-（3/2+4/5）8

1.3/7×49/9-4/32.8/9×15/36+1/273.12×5/6–2/9×34.8×5/4+1/45.6÷3/8–3/8÷66.4/7×5/9+3/7×5/97.5/2-（3/2+4/5）

1.125*3+125*5+25*3+252.9999*3+101*11*(101-92)3.(23/4-3/4)*(3*6+2)4.3/7×49/9-4/35.8/9×15/36+1/276.12×

88+56+12=88+12+56=100+56=156776*125*8=776*(125*8)=776*1000=776000

1、四分之一÷3÷六分之五=1/4×1/3×6/5=1/102、六分之五÷三分之二÷八分之五=5/6×3/2×8/5=23、四分之三×十五分之八÷十分之七=3/4×8/15×10/7=4/74、八分之

3又10分之2乘五分之8减3分之1等于多少56乘8分之7乘8分之7等于多少

3/4+0.25-25%=0.75+0.25-0.25=0.753/4+1/4-1/4=3/4一般这种题都统一化成分数或小数后再计算.

=0

1.3/7×49/9-4/32.8/9×15/36+1/273.12×5/6–2/9×34.8×5/4+1/45.6÷3/8–3/8÷66.4/7×5/9+3/7×5/97.5/2-（3/2+4/5）

(1)103÷73-159-57=(2)83×91÷131+38=(3)197-46+67-13=(4)38÷54×126-52=(5)192+52×136÷66=(6)123-47+159-16=(