算算填填.
= = 0.25×99+0.25= = == = = = 8×3.2+8×6.8=
能简算的要简算.(1)(12.5×8﹣40)÷0.6(2)6﹣(2﹣1)
简便运算.(+)×15×1768﹣7.5+32﹣2.5﹣(﹣)
(1)3318+312÷24×205(2)47.1×9.4﹣47.1÷2﹣+47.1(3)[(1﹣0.5)×20]÷[(1+0.25)÷4](4)(5)100﹣99+98﹣97+96﹣…+4﹣3+2﹣1(6).
直接写得数400÷25÷8= = 16.16÷16=25×1.6= 0.05+= =