直接写出得数3.5×0.3= 0.72÷0.9= 1﹣0.01= 0.2÷0.01=4.8+2= 0.25×40= 6.5﹣5.6= 1.25×8=
.
×+×.
1﹣×{1﹣×[1﹣×(1﹣)]}55×+145× 9999×9999+1999977×13+255×999﹣510.
计算:18+19+20+21+22+23.
①1.25×460×560 ②2.74×198 ③56÷(0.25×7) ④1.25×0.4+3.72×8×2.5 ⑤7200÷75 ⑥6.666×2490+2.222×2530 ⑦101﹣0.9﹣0.09﹣0.009﹣0.0009﹣0.00009 ⑧2000+1999﹣1998+1997﹣1996+1995﹣1994+…+3﹣2+1.