脱式计算(能简算的要简算)(1)()×24(2)(1+)×(1﹣)×(1+)×(1﹣)×…×(1+)×(1﹣)(3)2007×(4)2.5×0.875+0.25×1.25.
(559+197)÷27×16.
180÷5=36 100﹣36=64 64×20=1280.
8151÷39×120+490 410×36﹣7072÷34.