计算724﹣105×4 (976﹣955)÷3 (4802﹣4466﹣280)÷7.
用递等式计算(1)×÷ (2)÷×10 (3)÷×12 (4)(+﹣)×36.
13×4÷13×4= += 28﹣﹣= ( +﹣)×30=﹣= 100÷0.01= 2÷1+2×= =××= 6.54﹣2.8﹣1.2=
计算,能简算的要简算:(1)1÷4÷8÷0.25÷12.5 (2)9.75﹣5.42﹣(0.25+2.58)(3)8×2.7+6.2×1.4+3.5×8.6 (4)[+(20﹣4.7)×6]÷102.2.
能简算的要简算:(1)432×99﹣568 (2)14÷4﹣(3+5÷9)(3)51×68×78÷(17×34×13) (4)1×(2﹣0.75)+15÷.
下列各题,怎样简便就怎样算.(1)3.2﹣3.2×(3﹣2.5) (2)×÷× (3)8.5×99.