四则混合运算练习
1.
300+180÷5×2 600÷30-10+5
= 300+36×2 = 20-10+5
= 300+72 = 10+5
= 372 = 15
(300+180)÷5×2 600÷(30-10)+5
= 480÷5×2 = 600÷20+5
= 96×2 = 30+5
= 192 = 35
(300+180÷5)×2 600÷[30-(10+5)]
=(300+36)×2 = 600÷(30-15)
= 336×2 = 600÷15
= 672 = 40
2.
32×18-540÷45 (900-16×35)÷34
= 576-540÷45 = (900-560)÷34
= 564 - 12 = 340÷34
= 564 = 10
840÷[15×(32-28)] 26×[(144+36)÷36]
= 840÷(15×4) =26×(180÷36)
= 840÷60 = 26×5
= 14 = 130